Rename function for clarity.
Introduce the pano struct, now holding just a filename.
Initial implementation of mono panorama support. g_panos vector now holds a struct with type enum, assigned at directory traversal timestep(directories "panos" and panos2d".
Remove unused shaders.
Move pano geometry's spherical wall shaping into vertex shader.
Rename basictex shader to "pano".
Pass a uniform in to toggle use of spherical geometry for mono and stereo pano support.
Rename shader utility class member to a more descriptive name.
Clear color to black for pano geometry draw.
Add a line to README for mono panos.