Added an attacking move helper that gently pushes the player back if they are attacking towards an edge
-Pushback amount is exposed in Movement/AttackEdgePushbackAmount in MainDude
-Currently set to 100, which still allows the player to fall off the edge, but tends to leave the player close to the edge at the end of an attack
-Can be set to 0 to disable completely, 512 is generally enough to keep the player on a ledge even if spamming attack, but it's super obvious