Hyperspace additions

[NovaZHart]

Add missing hyperspace functionality:

• [x] Visual effects in hyperspace. (Not sure why this is broken.)
• [x] System exit meshes.
• [ ] Player ship is a glowing sparkly ball instead of a ship.
• [ ] Other glowing sparkly balls move around, representing enemy fleets. It is impossible to tell what is in the sparkly ball.
• [ ] When the player's sparkly ball touches another sparkly ball, they drop out of hyperspace to a random system on top of each other.
• [ ] Fleets from regionally-appropriate factions wander in hyperspace and intercept the player in the faction's territory.

[NovaZHart]

Work is in feature/hyperspace