Also removes the necessity of scheduling as it actually never worked as
intended, `Scheduler` will still update even when the chat line is
masked away, and the animation will never be held anyways.
The new duration of the animation should be enough for long scrolls
either way.
In the case a message arrives and the chat overlay is hidden, clicking
on the mention notification will not work as the `HighlightedMessage`
bindable callback will execute before the scheduled `newMessagesArrived`
logic (which was hanging since the message arrived until the chat
overlay became open because of the notification).
Simplify things by always scheduling the `HighlightedMessage` bindable
callback.
`currentChannel` gets instantiated once the chat overlay is open, while
`HighlightMessage` could be called while the chat overlay has never been
open.
This will all be rewritten with the new chat overlay design anyways, so
should be fine for now.
`Player` seems to handle this correctly locally already, which is to say
if the user attempts to toggle the pause state incorrectly, it will
still recover.
The logic stoppic this operation was only in the key binding handler,
which meant it was already possible from the now playing overlay this
whole time, so I *think* this should be quite safe.
This makes a few changes to bring things into a better shape during
mouse interactions with the mod panels:
- Dragging away from the panel now works in line with other buttons (ie.
`OsuButton`)
- Hovering now uses a lightened version of the current state, rather
than always using the active colour. I think this feels better.
- Mouse down now uses a transform point of 0.5. This is to give the
button a feeling of one of those latching light switches which resists
until reaching a point of overcoming the spring and switching state. I
think 0.4 (non-active) and 0.6 (from active) may work better, but left
at 0.5 for simplicity of implementation and I think it's good enough?
- Border always uses the gradiented version. I did this for simplicity
of implementation, but also think it looks better.
- Adjusted transform durations to feel better to me.
