Targeting Datums Renamed (and global) (#79513)

## About The Pull Request

[Implements the backend required to make targeting datums
global](https://github.com/tgstation/tgstation/commit/6901ead12e419530b7f646ea21094d4432d7385e)

It's inconsistent with the rest of basic ai for these to have a high
degree of state, plus like, such a waste yaknow?

[Implements
GET_TARGETING_STRATEGY](https://github.com/tgstation/tgstation/commit/d79c29134d03424a9f8bacd64c08cb41775fe8c0)

Regexes used:
new.*(/datum/targetting_datum[^,(]*)\(*\)* -> GET_TARGETING_STRATEGY($1)

Renamed all instances of targetting to targeting (also targetting datum
-> targeting strategy)

I've used GET_TARGETING_STRATEGY at the source where the keys are
actually used, rather then in the listing. This works out just fine.

## Why It's Good For The Game

Not a misspelled name through the whole codebase, very slightly less
memory load for basically no downside (slight cpu cost maybe but not a
significant one.

---------

Co-authored-by: John Willard <53777086+JohnFulpWillard@users.noreply.github.com>

code/datums/ai/basic_mobs/basic_subtrees/flee_target.dm

@@ -20,7 +20,7 @@
 	return SUBTREE_RETURN_FINISH_PLANNING //we gotta get out of here.
 
 /// Try to escape from your current target, without performing any other actions.
-/// Reads from some fleeing-specific targetting keys rather than the current mob target.
+/// Reads from some fleeing-specific targeting keys rather than the current mob target.
 /datum/ai_planning_subtree/flee_target/from_flee_key
 	target_key = BB_BASIC_MOB_FLEE_TARGET
 	hiding_place_key = BB_BASIC_MOB_FLEE_TARGET_HIDING_LOCATION