Conditional compilation with appDHT12, or instead with appBME280#1

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mitag wants to merge 2 commits intotomsuch:masterfrom

Commits on Jan 30, 2018

Adding appBME280 to M5Stack-SAM, APPS and GFX_MENU, to read from a Grove - Barometer Sensor.
mitag
committed

Commits on Feb 4, 2018

Adding #define WEATHER_SENSOR to compile with appDHT12, or instead with appBME280.
mitag
committed