Rework weapon scheme handling in frontend and fix a couple of bugs There were many oddities in weapon scheme editing which are fixed now: * When you left the weapon scheme editor, everything flashed briefly * When you leaft the weapon scheme editr, the weapon scheme selection always reverted to Default. Very annoying * Clicking on New or Copy now instantly creates and save the new weapons set

Fix molotov cocktails bouncing off vertically off rubber

Fix argument bug in default name of copy of copy of ammo scheme

Strip invalid PNG profiles from PNGs Bad PNGs caused a few annoying warnings like “libpng warning: iCCP: known incorrect sRGB profile”. Command used: pngcrush -rem gAMA -rem cHRM -rem iCCP -rem sRGB Note that many images have “@2x” in their name, this probably explains why they have been overlooked before.