Move virtual geometry draw to Slang + update BUILDING with new vulkan SDK version I use (but does not change much for now)

Fix crash when disabling and reenabling virtual geometry on a model

It was fun having my own version, but now using meshoptimizer to generate virtual geometry lod hierarchy

Fix crash when regenerating meshes: TLAS still referenced old mesh data when using ModelComponent (will need a way to automate this)

Preparing terrain for using meshoptimizer's clusterlod for virtual geometry:

Reuse engine Vulkan instance when converting assets, otherwise drivers seem to get confused and remove extensions?

Added imgui_tex_inspect to inspect textures from render graph debug

New scenes should not have .json extension (they are folders) + force save on new scene to create files on disk

Fix a few vk validation errors

Added imsearch: used for command autocomplete and searching for component members inside inspector

oops missing line in previous commit

Small cleanup

Add ImPlot and plot bars for length of render passes (not sure how useful this is)

Update ImGui!

Add table to compare render pass performance (to be updated to pie chart once I can update ImGui and get Implot working)