Added more severe consequences of radioactivity.

A very high amount of radioactivity can actually kill you.
Added option to allow/disallow mutation by radiation.

Also some rebalancing and formatting.
+signoff
Made font paths work for both SDL and wincurse.cpp
Stop hiding the mouse cursor with SDL
Make SDL play nice with CPU usage while listening for events
Actually return the ret value in item::acid_resist
Catch a lingering reference to the old skill data structure

Should fix #1436.
Merge external vehicle control with new '^' key. Fixes #1395.
Merge pull request #1424 from ethankaminski/acid-resist-returnval

Actually return the ret value in item::acid_resist
Sanity check for map::apply_light_ray() to avoid lightmap hangs.
Apply transparency effects on horizontal-dominant rays as well.
Batch of small fixes.
Make sdl FONDATA compatible with its gdi counterpart. Cache glyph data for sdl font to speed up DrawWindow. Filter shift, alt and ctrl keys.
Re-commit unsaved file last time.
Stupid error is stupid.
Merge branch 'master' of github.com:CleverRaven/Cataclysm-DDA into sdl-font-fix
Merge PR #1442 - lightmap fixes
Remove unnecessary fontpath from sdlcurse code.
Merge damaging radiation and optional mutations from rads.