Button.cpp: Linux: use white text on pressed buttons that can't get focus

Does not affect Dithered.
Menu buttons and buttons like the "Close" on Thermal asst that
should show white text while pressed.
MapOverlayButton.cpp: invert colors while pressed

Invert text color while pressed.
Show inverted backgound color while pressed even if transparent.
AndroidManifest.xml: disable debugging

Android market no longer allows this attribute
rcS.tophat: execute XCSoarData/kobo/init.sh if exists

Execute a user script of the user creates one
Version bump: TH 1.3.5, Android versionCode="28"