[LUA API] move lcd functions to lcd.* group

[JimB40]

from General popupConfirmation -> lcd.drawPopupConfirmation() popupInput -> lcd.drawPopupInput() popupWarning -> lcd.drawPopupWarning() also GREY() -> lcd.GREY()

from Bitmap Bitmap.open -> lcd.bitmapOpen() Bitmap.getSize -> lcd.bitmapGetSize()

Then Bitmap.* grup can be depreciated over time.