Rewrite a bunch of stuff

[x] Remove sound features
[x] Remove physics features
[x] Remove scripting features
[x] Remove Internet features
[x] Remove UI features
[x] Remove old editor, drastically cut down model viewer is now editor
[x] Move to C++20
[x] Use std::source_location for assertions if supported
[x] Rename all files in PascalCase
[x] Use precompiled headers
[x] Don't expose optimization flags to users of the engine
[x] Split the render function into render and update functions
[x] Use std::string_view where possible instead of const std::string&
[x] Add ImGui back to the engine, do not integrate it into entity system this time

craftablescience / ChiraEngine