Recognize some built-in functions

Less code

Prefix followed by prefix issue solved. Also some slight improvements.

Fix for issue #291 - this check should probably be in ApplyDamage though

Disable loading content.html on startup, it is fetched on pushing to top of stack already.

increase land tex size to 512, which is the current minimum required just to load a hat. On my system max fps rose from 840 to 890 - about 6% change. also a nil check, probably not needed.

move the order of reloading texture to workaround buggy drivers

Only recreate texture for non-empty lines

Remove a bunch of unnecessary nil checks. FreeTexture does its own nil check.

reset chat lines too

Make Highlander moar awesome.

Since I'm storing the text string anyway, might as well recreate captions on resize as well

Not useful.

Aaand in .17

oops. tex could expire, too...

Aaaand merge .17 into trunk.