Scripts/SmartAI: SMART_TARGET_INVOKER cleanup step 1. The core will now log errors on start-up if SMART_TARGET_INVOKER abuse is found, but will continue to load the scripts as deprecated for now.

Note that a lot of these scripts may either not currently work, not work reliably, or may be prone to breaking unexpectedly when core internals change. SMART_TARGET_INVOKER is undefined behavior on any event that doesn't directly specify its invoker.

(We are considering options for allowing INVOKER to make sense in timed action lists in a reliable fashion, so they are exempted at this time.)

(cherry picked from commit 482328bddf)

sql/updates/world/master/2021_06_20_05_world_2018_02_13_04_world.sql

@@ -0,0 +1,2 @@
+-- SMART_ACTION_FLEE_FOR_ASSIST (25) does not need a target
+UPDATE `smart_scripts` SET `target_type`=0 WHERE `action_type`=25;