cmake: install the asset files

barrage: fix loading of bulletml xmls

barrage: simplify loading bulletml xmls

rand: use array.ptr

actorpool: fix index wrangling

gl3n: use vecN operators

texture: fix some whitespace nits

tunnel: protect against unsigned underflow

paths: abstract out the paths for data and such

gl: use a support library for gles/gl3 support

gl: add a shaderprogram class

iterator: remove dead code

pad: use scancodes

soundmanager: use the actual filename

d: mark initialized constants as static