Remove Secure Connection macro and add the config to wifimanager. (#961)

This adds the ability to specify if the MQTT broker connection is secure via a checkbox on the config page of WiFiManager.
Also added to the WiFiManager config page is a text box to enter the brokers TLS certificate.

In the case of using manual configuration a new macro is created MQTT_SECURE_DEFAULT.
When defined as true a secure connection will be requested and the certificate defined in user_config.h will be used.

platformio.ini

@@ -71,8 +71,8 @@ extra_configs =
 ;default_envs = uno-fastled
 ;default_envs = atmega-all-test
 ;default_envs = manual-wifi-test
-;default_envs = esp32dev-tls-test
-;default_envs = nodemcuv2-tls-test
+;default_envs = esp32dev-mqtt-fw-test
+;default_envs = nodemcuv2-mqtt-fw-test
 ;default_envs = nodemcuv2-rs232
 ;default_envs = sonoff-rfbridge-direct
 
@@ -105,7 +105,7 @@ bmp180 = BMP180#efac46bd8d
 htu21 = SparkFun HTU21D Humidity and Temperature Sensor Breakout@1.1.3
 ahtx0 = Adafruit AHTX0
 ina226 = https://github.com/jarzebski/Arduino-INA226.git#968a684
-a6lib = https://github.com/1technophile/A6lib.git
+a6lib = https://github.com/h2zero/A6lib
 wifimanager = https://github.com/tzapu/WiFiManager.git#c3ff582
 ethernet = Ethernet
 esp8266_mdns = esp8266_mdns
@@ -826,29 +826,27 @@ build_flags =
   '-DGateway_Name="OpenMQTTGateway_TEST_MANUAL_WIFI"'
 board_build.flash_mode = dout
 
-[env:esp32dev-tls-test]
+[env:esp32dev-mqtt-fw-test]
 platform = ${com.esp32_platform}
 board = esp32dev
 lib_deps =
   ${com-esp.lib_deps}
 build_flags =
   ${com-esp.build_flags}
-  '-DSECURE_CONNECTION'
   '-DMQTT_HTTPS_FW_UPDATE'
-  '-DGateway_Name="OpenMQTTGateway_TEST_TLS"'
+  '-DGateway_Name="OpenMQTTGateway_TEST_MQTT_FW"'
 board_build.flash_mode = dout
 
 
-[env:nodemcuv2-tls-test]
+[env:nodemcuv2-mqtt-fw-test]
 platform = ${com.esp8266_platform}
 board = nodemcuv2
 lib_deps =
   ${com-esp.lib_deps}
 build_flags =
   ${com-esp.build_flags}
-  '-DSECURE_CONNECTION'
   '-DMQTT_HTTPS_FW_UPDATE'
-  '-DGateway_Name="OpenMQTTGateway_TEST_TLS"'
+  '-DGateway_Name="OpenMQTTGateway_TEST_MQTT_FW"'
 board_build.flash_mode = dout
 
 [env:rf-wifi-gateway]