Updated Kanara model and texture
New Kanara model

Finally finished it.
Has 3 lods, the lowest is quite ugly, but it's small enough to get away
with it.
Updated the shipdef.lua for the kanara
removing gun and camera data
upgrade miniz and use inline
Let Rand.New(seed) raise an error if seed is given, but non-numeric.
Merge remote-tracking branch 'lwho/rand_new_fail'
Show altitude even when not in rotating frame.
Show vertical speed together with altitude.
Merge branch 'inline-miniz'
Merge remote-tracking branch 'nozmajner/new_kanara'
look for SDL2 in configure
start of SDL2 support class, untested
convert keyboard types, get gui compiling
get ui compiling
move SDLGraphics to Graphics::WindowSDL
first stab at moving SDL and GL init into WindowSDL
get TextureBuilder compiling
renderers now carry their window around, so call through it
fix key state arrays aren't really going to fly anymore...