[SYS] Password management improvements (#1787)

* Use one single password for Access point, OTA and WebUI access
* Enable to change the password during WM onboarding, with the WebUI, and MQTT command
* Remove the default password during the first configuration to connect to the AP
* When using the last 8 digits of the MAC as the password, it can now be changed
* Remove gateway password sending to client

main/config_WebContent.h

@@ -43,11 +43,12 @@
 
 #define configure_1 "<p><form action='wi' method='get'><button>Configure WiFi</button></form></p>"
 #define configure_2 "<p><form action='mq' method='get'><button>Configure MQTT</button></form></p>"
-#if defined(ZgatewayCloud)
+/*#if defined(ZgatewayCloud)
 #  define configure_3 "<p><form action='cl' method='get'><button>Configure Cloud</button></form></p>"
 #else
 #  define configure_3
-#endif
+#endif*/
+#define configure_3 "<p><form action='cg' method='get'><button>Configure Gateway</button></form></p>"
 #define configure_4 "<p><form action='wu' method='get'><button>Configure WebUI</button></form></p>"
 #define configure_5 "<p><form action='lo' method='get'><button>Configure Logging</button></form></p>"
 #ifdef ZgatewayLORA
@@ -82,7 +83,7 @@ const char config_body[] = body_header "" configure_1 "" configure_2 "" configur
 
 const char reset_body[] = body_header "<div style='text-align:center;'>%s</div><br><div style='text-align:center;'>Device will restart in a few seconds</div><br>" body_footer_main_menu;
 
-const char config_cloud_body[] = body_header "<fieldset class=\"set1\"><legend><span><b>&nbsp;Cloud Configuration&nbsp;</b></span></legend><form method='get' action='cl'><p><label><input id='cl-en' type='checkbox' %s><b>Enable Cloud Connection</b></label></p><br><p><label><input id='cl-lk' type='checkbox' disabled><b>Cloud Account%s Linked</b></label></p><br><button name='save' type='submit' class='button bgrn'>Save</button></form></fieldset><p><form action='%s' method='get'><input type='hidden' name='macAddress' value='%s'/><input type='hidden' name='redirect_uri' value='%s'/><input type='hidden' name='gateway_name' value='%s'/><input type='hidden' name='uptime' value='%d'/><input type='hidden' name='RT' value='%d'/><button>Link Cloud Account</button></form></p>" body_footer_config_menu;
+//const char config_cloud_body[] = body_header "<fieldset class=\"set1\"><legend><span><b>&nbsp;Cloud Configuration&nbsp;</b></span></legend><form method='get' action='cl'><p><label><input id='cl-en' type='checkbox' %s><b>Enable Cloud Connection</b></label></p><br><p><label><input id='cl-lk' type='checkbox' disabled><b>Cloud Account%s Linked</b></label></p><br><button name='save' type='submit' class='button bgrn'>Save</button></form></fieldset><p><form action='%s' method='get'><input type='hidden' name='macAddress' value='%s'/><input type='hidden' name='redirect_uri' value='%s'/><input type='hidden' name='gateway_name' value='%s'/><input type='hidden' name='uptime' value='%d'/><input type='hidden' name='RT' value='%d'/><button>Link Cloud Account</button></form></p>" body_footer_config_menu;
 
 const char token_body[] = body_header "<div style='text-align:center;'>Link Cloud Account</div><br><div style='text-align:center;'>Cloud was successfully linked</div><br><div id=but2d style=\"display: block;\"></div><p><form id=but2 style=\"display: block;\" action='cn' method='get'><button>Configuration</button></form></p>";
 
@@ -98,6 +99,8 @@ const char config_wifi_body[] = body_header "%s<br><div><a href='/wi?scan='><b>S
 
 const char config_mqtt_body[] = body_header "<fieldset class=\"set1\"><legend><span><b>MQTT Parameters</b></span></legend><form method='get' action='mq'><p><b>MQTT Server</b><br><input id='mh' placeholder=" MQTT_SERVER " value='%s'></p><p><b>MQTT Port</b><br><input id='ml' placeholder=" MQTT_PORT " value='%s'></p><p><b>MQTT Username</b><br><input id='mu' placeholder=" MQTT_USER " value='%s'></p><p><label><b>MQTT Password</b><input type='checkbox' onclick='sp(\"mp\")'></label><br><input id='mp' type='password' placeholder=\"Password\" value='%s'></p><p><b>MQTT Secure Connection</b><br><input id='sc' type='checkbox' %s></p><p><b>Gateway Name</b><br><input id='h' placeholder=" Gateway_Name " value=\"%s\"></p><p><b>MQTT Base Topic</b><br><input id='mt' placeholder='' value='%s'></p><br><button name='save' type='submit' class='button bgrn'>Save</button></form></fieldset>" body_footer_config_menu;
 
+const char config_gateway_body[] = body_header "<fieldset class=\"set1\"><legend><span><b>Gateway Configuration</b></span></legend><form method='get' action='cg'><p><b>Gateway Password (8 characters min)</b><br><input id='gp' type='password' placeholder=\"********\"></p><br><button name='save' type='submit' class='button bgrn'>Save</button></form></fieldset>" body_footer_config_menu;
+
 const char config_logging_body[] = body_header "<fieldset class=\"set1\"><legend><span><b>OpenMQTTGateway Logging</b></span></legend><form method='get' action='lo'><p><b>Log Level</b><br><select id='lo'><option %s value='0'>Silent</option><option %s value='1'>Fatal</option><option %s value='2'>Error</option><option %s value='3'>Warning</option><option %s value='4'>Notice</option><option %s value='5'>Trace</option><option %s value='6'>Verbose</option></select></p><br><button name='save' type='submit' class='button bgrn'>Save</button></form></fieldset>" body_footer_config_menu;
 
 const char config_webui_body[] = body_header "<fieldset class=\"set1\"><legend><span><b>Configure WebUI</b></span></legend><form method='get' action='wu'><p><b>Display Metric</b><br><input id='dm' type='checkbox' %s></p><p><b>Secure WebUI</b><br><input id='sw' type='checkbox' %s></p><br><button name='save' type='submit' class='button bgrn'>Save</button></form></fieldset>" body_footer_config_menu;