Overhauled the palette system. Hopefully that's the end of those pesky palette bugs...
Added support for multiple mod folders.
Fix screen not working when decreasing resolution with OpenGL and game resolution enabled.
fix soldier info from memorial screen

list order is reversed for dead guys
fix GCC
don't let aliens pathfind through soldiers they can see

(fixes AI hang)
alter efficacy somewhat
alter earlier pathfinding fix

make it units spotted this turn, rather than currently visible.
lodePNG, SDL and OGL all hate 1366x768
Missed a palette.
set seconds remaining for ufos that spawn on the ground
Correct "caseInsensitive" to "caseInsensitiveFolder"
fix palette in alien base discovered window
Merge pull request #812 from DarkDefender/patch-1

Correct "caseInsensitive" to "caseInsensitiveFolder"
Use UI volume for window popup sound.
Merge pull request #813 from boozedog/use_ui_volume_for_soundPopup

Use UI volume for window popup sound.
Fixed game over screens.
Code cleanup.
Cleaning up Advanced Options.
Fixed graphs always using Total scale.