Fix crosshair shader
Modify default config
HUD: Add new elements
Remove unused icons for missionpack items
Add button shader
Improve bot files
Fix viewBloodBlend shader, add nopicmip
Add OpenArena maps
Add make options: pack, maps

Add .gitignore, maplist
Add ambient sounds
Use pak3-oamaps.pk3 for all oa maps and textures
Add maps, improve make script
Remove net.jpg (use lag.tga instead)
Remove old bots
Update HUD file
HUD: Use a single number for font size
Add menu artwork, remove unused weaphits

button.tga is fron Xonotic, the rest from OpenArena