Remove Secure Connection macro and add the config to wifimanager.

[h2zero]

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.

[h2zero]

Build fails on env:nodemcuv2-2g

platformio/packages/framework-arduinoespressif8266/tools/sdk/libc/xtensa-lx106-elf/lib/libc.a(lib_a-sscanf.o): in function sscanf': /home/earle/src/esp-quick-toolchain/repo/newlib/newlib/libc/stdio/sscanf.c:411: multiple definition of sscanf'; .pio/build/nodemcuv2-2g/lib621/libA6lib.a(sscanf.cpp.o):sscanf.cpp:(.text.sscanf+0x4): first defined here

Cause is the A6lib sscanf.cpp is redefining newlib functions. Seems that the file could be removed from the lib as that was included before newlib was in the 8266 framework I believe.

[1technophile]

Cause is the A6lib sscanf.cpp is redefining newlib functions. Seems that the file could be removed from the lib as that was included before newlib was in the 8266 framework I believe.

I would suggest to fork it, modify and point to the fork temporarily.
You may submit a PR to the A6lib repo.

[h2zero]

Cause is the A6lib sscanf.cpp is redefining newlib functions. Seems that the file could be removed from the lib as that was included before newlib was in the 8266 framework I believe.

I would suggest to fork it, modify and point to the fork temporarily.
You may submit a PR to the A6lib repo.

done