Networking Update

Added A better SwitchLevel() method to disconnect the client first
before switching levels between lobby and MainMenu. This uses the
IEnumerator DoSwitchLevel().

Created empty Object to load the DeckBuilder scripts. Object called
DeckBuilder_Scripts.

Deleted MainMenu() in the MainMenu.cs file. method was useless

Added SpawnPoint array
Added Character Prefab to spawn a player upon level load
Player now spawns properly upon creating a game or joining one.
Player assigned to different camera works.

Short-term goals to do.
- Clean up the code
- Fix the mouse camera
- Fix various warnings
- Remove camera audio listeners