Fix scaling of bone-less models with r_vboVertexskinning 0.
Move Vertex and Index data into aligned arrays.
Delay mipmap computation of cubemaps until the texture is complete.
Use unsynchronized glMapBufferRange for VBO upload if possible.
Avoid glVertexAttribPointer calls during world rendering.
Merge branch 'master' into vertexpack

Conflicts:
	src/engine/renderer/tr_bsp.cpp
	src/engine/renderer/tr_surface.cpp
	src/engine/renderer/tr_vbo.cpp
Remove double setting of vertex attrib pointers and improve Scissor.
Remove unneeded call of va() in Tess_UpdateVBOs.
Fix grenade and other missiles scaling.
Use static VBOs where possible.
Merge branch 'master' into vertexpack
Add guarding #ifdefs around GLEW_ARB_buffer_strorage
Invalidate tess.surfaceShader after scissor is updated.

This prevents incorrect batching of multiple StretchPic commands.
Merge branch 'master' into vertexpack
Merge branch 'vertexpack'