RC4

Fixes:
-A bit of extra details.
-Spies no longer want to hug trees that much.
-Blocked an insane sightline which benefited Sniper bots a lot.
-Nerfed an overpowered Sniper spot. (hopefully)
-Improved bot navigation.
-Bots can no longer be catapulted on top of the houses at the front. This will prevent players from being able to trap the bomb on top of the buildings.
-Sentry Busters no longer self detonate as soon as they spawn when putting Sentries on top of front rocks.
-Added relays mission makers can use to open/close the front upgrade station during a wave.
-Arrows with the penetration upgrade will no randomly break on the map. (Thanks Freyja) Except on top of the front buildings. This is due buggy interactions with arrows with penetration and respawnroomvisualizers. Which only Valve can fix.

Missions:
-Intermediate received several changes to make it easier.
-Expert received several changes to make it harder.