Housekeeping

• Make exception codes all share the same numerical space (make them all unique/distinguishable)
• Refactor core/systems/* into core/* subfolders (render, script)
• Create a logging system to replace the bespoke printfs
• Make UML graph for complex systems
• Separate Assets into base and RuntimeAssets (precompile()ing and net streaming should be runtime only)
• Fully split the h_core::Runtime* classes into h_runtime::* ones
• Add a doGUI() to the asset base class (instead of bespoke implementations within the runtime debugger)
• Add a way of setting component defaults in actorspec