Ladders with 3 or fewer soldiers can be successfully pushed off walls
Ladders with 4+ soldiers become too heavy to completely dislodge

Set postfix priority to last to prevent crash when trying to unpatch RBM methods. Thanks to Cheyron for letting me know about the issue.

Lowered the time for the Battering ram to destroy the outer gates, it is still longer than vanilla but faster than before.

Adjusted siege towers speed to prevent them to be destroyed all the time and implemented code to make defender AI push down ladders when using RBM AI.

Restored Battering ram speed to vanilla speed as an attempt to prevent attacker AI retreating too soon even before reaching the gates.

Fixed siege towers HP changes not being applied correctly, thanks to RogueDemonKing for letting me know about the issue to fix it.

Increased battering ram and siege towers speed closer to vanilla speed due to AI being too dumb
Increased siege towers HP a little bit more

-Removed a few unnecessary and unnoticeable changes
-Buffed siege towers speed a bit (still slower than vanilla)

Reverted the battering ram to its original HP value 20000 instead of 30000, so defenders have more chance to destroy it before it reaches the gates. It was way too strong before.

Minor changes.