Especially on 8266, the usermod can cause unexpected shut-downs in default configuration, when A0 is not connected to a battery voltage measurement circuit.
Fix 1d/2d default in customeffect, games and weather
index.htm: add buttons and text area for genPresets
index.js: add genPresets, uploadFileWithText and savePresetsGen
fx,cpp: set fire 2012 default palette 0 (fire colors)
Bonus: battery USERMOD_BATTERY_MEASUREMENT_PIN default -1