Unobtanium - Vault Hunters Fixes

Experimental Performance Tweaks: Reworks how Vault data is synced to players, should improve server performance dramatically if vault contains a lot of data.

Held Abilities Fix: Fixes an issue causing your held abilities (like Vein Miner) to toggle off if you raise/lower its level while having it activated.

Thanks to Zaratath for contributions.

With these changes, Unobtanium is required on both client & server in order to work correctly.