Renderer: Implement material system

Implement material system, set world BSP surfaces to use it. Material system works by generating enough materials (a distinct GL state that has to be set for the whole draw call) for each stage of every drawSurf_t.
All of the per-surface data that was previously set through uniforms for each drawSurf_t is now sourced from a buffer.
The remaining (global) uniforms like u_ViewUp and u_ViewOrigin are still set as usual.
Updates for surfaces whose parameters change with time are done by mapping the corresponding part of the memory and copying all of the data into it, then flushing it all at once.

Implement bindless texture support.

src.cmake

@@ -102,6 +102,10 @@ set(RENDERERLIST
     ${ENGINE_DIR}/renderer/tr_font.cpp
     ${ENGINE_DIR}/renderer/InternalImage.cpp
     ${ENGINE_DIR}/renderer/InternalImage.h
+    ${ENGINE_DIR}/renderer/Material.cpp
+    ${ENGINE_DIR}/renderer/Material.h
+    ${ENGINE_DIR}/renderer/TextureManager.cpp
+    ${ENGINE_DIR}/renderer/TextureManager.h
     ${ENGINE_DIR}/renderer/tr_image.cpp
     ${ENGINE_DIR}/renderer/tr_image.h
     ${ENGINE_DIR}/renderer/tr_image_crn.cpp
@@ -141,6 +145,8 @@ set(RENDERERLIST
 )
 
 set(GLSLSOURCELIST
+    ${ENGINE_DIR}/renderer/glsl_source/material_vp.glsl
+    ${ENGINE_DIR}/renderer/glsl_source/material_fp.glsl
     ${ENGINE_DIR}/renderer/glsl_source/skybox_vp.glsl
     ${ENGINE_DIR}/renderer/glsl_source/ssao_fp.glsl
     ${ENGINE_DIR}/renderer/glsl_source/ssao_vp.glsl