make the docs a little nicer

main changes:
- add parameter and return types where applicable
- use @module and @classmod tags at the top of files
- remove some redundant descriptions of return values, especially for functions that return a boolean

recommended next steps:
- more consistent grammar
- add links to classes and functions in descriptions where appropriate
- be consistent about naming Systems vs. SystemClasses and Components vs. ComponentClasses

config.ld

@@ -1,3 +1,4 @@
 project = 'Concord'
 description = 'A feature-complete ECS library'
-file = {'concord', exclude = {}}
+file = {'concord', exclude = {}}
+dir = 'docs'