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Description

May require #215 and #208 to be done before.

1. MaterialManager i creating Ref<> with memnew
2. it is incorrectly allocating MaterialParser with memnew
3. MaterialParser extends RefCounted -> should be implemented as singleton

Minor:

5. game_dir handling issues -> Reimplement UserSettings in C++ #215
6. Incorrect (circular) dependency on MaterialManager: MaterialParser::parse(MaterialManager *material_manager, const String &model_path, const String &material_path) -> should be just FileAccess there

This could lead to memory leaks and segfaults.

Reproduction steps

1. Read the source code
2. Analyse objects memory lifecycle / Use profiler
3. Observe strange segfaults and behaviors

Screenshots and attachments

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