Switch default scaling factor to 0.75 as most ppl seem to have 96dpi screens instead of previous assumed 72

Copy only minetest_game to apk by default
Don't copy .git and .svn folders to apk
Fix bouncing asset copy scrollbar due to long filepaths
Reenable font scaling to fix broken menu on high dpi screens
Implement minetest loglevel to android loglevel mapping
Disable touch digging while moving around

The player dropping the node can either be themselves or another player (i.e. without this fix you can crash other people's clients)
Thanks CWz for reporting the issue

This fixes the Mapgen V5 calcLighting segfault

Also add NodeResolver callbacks on the client

The cause of a single light source seemingly being lit without spread
was due to its creation in the +Y mapblock boundary layer during map
generation, which was ignored as the overtop.  This overtop explicitly
needs to be omitted during sunlight propagation, however.  To accomplish
this, Mapgen::calcLighting() was split into separate functions taking
separate parameters.
Additionally, do not diminish light too early during spread.  This fixes the
output inconsistency between Map::updateLighting and Mapgen::calcLighting.

Just Markdown, no variant of it. File name intentionally
not changed to “lua_api.md” because of fear to break references
to that file. The file can still be renamed later.

Use/add stone_surface_max_y to speed-optimise/guide dungeon generation
MgV7: Don't let mountain terrain chop dungeons at mapchunk borders
Make mountain terrain update stone_surface_max_y for caves in mountains