Add Random / Mirror support

[dtinth]

Requests:

• https://discord.com/channels/427735173606670336/427735173606670338/902305518993944619

In regard to my question:

Hm… In other games are plays with RANDOM ranked? I may not have time to implement it but I may track this feature in an issue.

Comment by Chriszo:

Regarding Random: On a charts Leaderboard on LR2IR it's the same for Random and Non-Random scores. But it get's marked that you played with Random so everyone knows it.

We surely can debate if charts played with Random or not should be on the same leaderboard, bcs ... well, you play the chart differently. Some people say yes, some people say no. But one thing is for sure: For training purposes, it's extremly useful (same as mirror) 👍