Draft: Dotrix 0.6

[voxelias]

Major refactoring is going here, that will bring totally new engine core and solve lots of small issues bothering us for a while already.

This brings up

• [x] Tasks concept with parallel execution
• [x] New application API with possibility to configure extensions
• [x] Flexible Mesh API that allow to construct meshes and their buffers with validation and various layouts
• [x] Shader preprocessor (includes, conditions, variables)
• [x] UUID format for IDs with namespaces
• [x] ECS update: locks, soft deletion of entities and reuse of released slots, faster lookup for an entity by its ID
• [x] Tasks based assets loading, flexible API, custom assets
• [x] Constant FPS (if host machine is powerful enough)
• [ ] GPU Driven Rendering
• [ ] New tasks driven input API
• [ ] Optimized overlay