Moved some remaining constants into src (#2501)

* Moved all npc view constants into src

Source side the constants will use Gravity's naming standard(JT_*)
NPC side still supports the old names without JT_

* Moved all effect constants into src

Added check for effect validation to atcommand effect and all script commands using them
Removed the unused and broken function unit_changeviewsize from unit.c
Replaced a lot of hardcoded effect ids with their respective constants
Cleaned up the effect documentations

* Moved all hat effect constants into src

Added check for effect validation to script command hateffect

conf/msg_conf/map_msg.conf

@@ -1621,7 +1621,8 @@
 1475: ---- My Channels ----
 1476: You have not joined any channels.
 
-//1477 free
+// @effect
+1477: Please enter a valid effect id in the range from %d to %d.
 
 // @partysharelvl
 1478: Party share level range has been changed successfully.