Add `UserInput::Sequence` and `InputInterval`

[Shute052]

Allows users to define a specific pattern of inputs.

let throttled_double_click = UserInput::Sequence {
   pattern: vec![MouseButton::Left, MouseButton::Left],
   intervals: vec![InputInterval::Range(50ms, 200ms)],
});

let invincible_cheat_keys = UserInput::sequence(vec![Up, Up, Down, Down, Left, Right, Left, Right, B, A, B, A]);

With these:

pub enum InputInterval {
    None,
    AtLeast(milliseconds),
    AtMost(milliseconds),
    Range(min_milliseconds, max_milliseconds),
}

[alice-i-cecile]

Previously: #49 :) I'll close that out: this is a better name.

P.S. This gets the enhancement label, since it's a whole new feature.

[Shute052]

This should halt its implementation stage before #483.
Otherwise, it will make the current internal system extremely complex.

[RomainMazB]

As far as I understand, this issue was blocked by #483 which was somewhat replaced by #534 which was merged.

So is the blocked label still accurate?

[alice-i-cecile]

Good catch: this is no longer blocked!