Minimize BLE resources. (#1015)

Adds macros to reduce the flash/RAM use of the BLE library.

platformio.ini

@@ -151,6 +151,8 @@ build_flags =
   '-DsimpleReceiving=true'
   '-DZmqttDiscovery="HADiscovery"'
   '-DTRACE=1'
+  '-DCONFIG_BT_NIMBLE_ROLE_PERIPHERAL_DISABLED'
+  '-DCONFIG_BT_NIMBLE_ROLE_BROADCASTER_DISABLED'
   ;'-DCORE_DEBUG_LEVEL=4'
 
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