Implement Optional Instrumentation #10
Description
Add an optional (toggled by a define) instrumentation system which allows users to track various statistics about the usage of various entities, systems and components.
It's important that this is all entirely optional, to avoid any performance impact in releases.
Examples of stats we could collect:
- System ordering
- Number of fetches within an update (i.e. usage of componentmapper)
- The number of matching entities in an update cycle