Unbreak build without stl compatibility

merge

even more wrapping with find_package_or_disable_msg

update option list

introduce find_package_or_fail/disable to group together similar cmake code

link png library in code on osx

Fix frozen hog rendering

Fix check for flag

hopefully closes issues 541, 312 and 503

yeah. this was a bad idea. the minor difference in thaw speed vs last hog of team never unthawing.

prevent an old abuse of parachute to land safely

fix fade to black in training

PhysFS-aware check for directory existence. Should fix issue #511.

skip frozen hogs in switch

Add missing feedback button translation

This has bothered me for the longest time. Move texture so it doesn't overlap. I'd initially had a test for isPaused, but jumping texture bothered me.

our cmake modules have become good enough, prefer them over system ones

Backed out changeset 4cccc0520988

our cmake modules have become good enough, prefer them over system ones

write FindGHC.cmake for haskell stuff

*sigh* I always forget to pull when AFK for a while. btw. why are we still keeping binaries in here? ☹

user correct variable and slimmer test, version typos, .dll.a updated

extend time a bit. move to defrosting on team's turn. fairer than using round order I think.

comas and capitals

rework ffmpeg/libav/videorec linking and their cmake discovery

rewritten findfreepascal, moved checkstack code elsewhere

support old cmake style variables

merge

rewritten findffmpeg.cmake

replace sdl mixer/image version checking with something more robust