Fixed a batch of warnings in MP's game/ai_main.c.
Reported by @Yberion. Thanks.
Support up to 32 buttons in single player.  Commands registered for 0-15 for now.
Buttons 0-8 are just aliases for the existing buttons.
Alt tab now supported in SP when in fullscreen.
Add Shift+PgUp/PgDn 5 line scrolling for MP.
Cleaned up the code for the above in SP too.
Improved status command for the console.  Is mostly inspired by the SOURCE status cmd.
Fixed svsay console output message.
Forgot to include FS_GetCurrentGameDir.
Some SP DLL syscall fixes/cleanup.
Allow cg_fov to be archived in SP.
Merged MP fixes for CS_ITEMS buffer overflow.
Add missing inventory use cmds to auto complete list
Fixed wrapped 128 value warning.  Should be 127.
Uhh forgot a return type here apparently :|
Update README.md about lacking 64-bit support
Fixed #53. Assertions should be used to check the validity of the
software, not the assets it uses. It's valid for the game to mark a shader
stage as inactive when the game cannot find the texture map for the stage.