Unity 6 Upgrade

This update is motivated by a Unity upgrade, It may have positive consequences on the performances, and fixes the crashes on loading a scene that some of you had. In addition to that it contains the following things : - Entire rework and optimization of the loading of the maps to shorten the waiting time and smooth out the experience - Fixed ragdoll behavior of kicking the legs randomly when tucked - Improved splash effect depending on water penetration - Wetsuit clothing gear for the male character - Tweak on trampoline horizontal velocity of jumps - Addition of motion blur for high and ultra, a dedicated toggle will come in the settings in the future - Fix ui bugs in the settings - Fix vaults issues on the arena blocs - Fix unexpected camera traveling when entering replay mode - Alternative Input system for Free fall mode available in the settings