Narrow aabb types and give generic aliases their type argument

The aabb functions all index the named members, so passing the
shorthand [MapPosition, MapPosition] form would error at runtime. The
annotations now say so.

emmylua requires a type argument on a generic alias, luals did not.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

exp_util/module/selection.lua

@@ -23,7 +23,7 @@ local Selection = {
     --- @field player_index number
     --- @field selection Selection.Active
 
-    --- @type table<string, { [defines.events]: Selection.event_handler[] }>
+    --- @type table<string, { [defines.events]: Selection.event_handler<any>[] }>
     _registered = {},
 
     --- @package