2s_Pluper a4

From small biscuit's 2Koth prefab to saph's 2S prefab, because people are whining yet again about the gamemode. Yes, 2S was used at the start, i made one simple change from the original : points don't take an eternity to cap.

• Added an explanation "board" in spawn
• Added a useless "map made by" overlay in spawns
• Made the lower entry to A higher to allow attacker to have less of an advantage thus theoretically improving the flow of the point between teams
• B is unchanged as it seems to flow between teams.
• Removed a weird ammo pack and some wooden platforms leading to it, it was cluter and the pack was rarely usefull.

• Added courtyards from spawn to B and from A to B
• Changed the gamemode from 2S to 2koth
  • This means the points are faster to cap and time ticks when both points are capped
• Lowered A
• Added a pack under A

I made the s in the name a lowercase, still a1