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/// Loop related features.
/// Window and render managers.
/// Colors related features.
/// Shapes/Geometric forms related features.
/// Macros of the engine.
/// Entity-Component-System related features and architecture.
/// Engine context related data stored for the end-user.
/// Input related features.
/// Physics related features.
/// Time related features.
/// Audio related features.
/// Camera related features.
/// Text processing and rendering related features.
/// Asset loading related features.
/// Texture related features.
/// Visibility related features.
/// Draw ordering related features.
/// Animation related features.
/// Event dispatching related features;
pub