rendersystem_vulkan: get this compilable again with a flag, easier to work on instead of one massive branch with all the vfx changes too * strip all glsl support, added dxc hlsl -> spirv, and convert any built in shaders to hlsl * backport new texture manager to match the new dx11 texture manager * various backports to match our dx11: barriers, fences, gpu buffers, descriptor sets, etc. * only use VK_EXT_debug_utils instead of VK_EXT_debug_marker * strip multi-gpu