The beginnings of platforms
Fixed scripts and added needed objects to make them work, which includes 4 empty objects:

- Managers: empty objects containing all managing objects
- Skyline far manager: empty object that controls the spawn mechanics for the furthest skyline
- Skyline close manager: same as above, but for the closest skyline
- Platform manager: empty object that controls spawn mechanics for the platforms; variables can be changed in the project window to increase and decrease min and max sizes, as well as gaps between platforms.

Changed scripts to handle the Player, rather than an arbitrary Runner, which was mainly used for local testing.

Added some placeholder materials to Cubbart, skylines and platforms - all subject to change

Added a prefab folder that holds all prefabs; makes managing of randomized spawns easier and project window less cluttered.
Created prefabs for skylines and platforms

Signed-off-by: Tewlip <shartm12@student.aau.dk>
Merge remote-tracking branch 'origin/New-branch' into Main_Branch

Fixed conflicts and removed Runner scripts; it's unnecessary.