Prototype v3.1 hotfix

Some day 1 changes I've made.

Balance changes:

• Player - Free-falling drag reduced
• Fighter_Gungine - Bullet trail's lifetime increased to 10 seconds (was 6 seconds)

Bugfixes:

• Border and water collider thickness doubled to prevent player from leaving out of bounds with Turbo engine
• Most of the player's projectiles, except for the sawblade, are no longer slowed while inside an enemy's hitbox