Implement Random selection for character and map selection

[azriel91]

In GitLab by @azriel91 on Jun 10, 2019, 17:33

Currently selecting random doesn't actually select a random character or map.

Implement this, with the following variants:

• Players will not know what character is used until the game has started.
• Players will not know what map is used until the game has started.
• Players can restart a match without resetting the random selections.
• Players can restart a match with reset random selections.
• Random seed should be (re)initializable across network.

[azriel91]

Files touched:

$ rg -Fi 'implement random' -t rust --no-heading | tr -s ' ' ' '                                                                                                                                                                              
crate/game_loading/src/system/map_selection_spawning_system.rs: // TODO: implement Random
crate/map_selection/src/system/map_selection_system.rs: // TODO: implement random.
crate/character_selection/src/system/character_selection_system.rs: // TODO: Implement Random

[Lighty0410]

Assign me please :O