Implement random playback positioning

[spbnick]

No description provided.

[sabbaka]

I've finally made progress bar to show current playback position more or less smoothly ( next step could be adding animation to make it really smooth ).
https://youtu.be/TgPMeOtKaDY
Next step in terms of required functionality will be adding actual jump-to selected place.

[spbnick]

Hey, looks nice! How hard would it be to make it look like a slider instead of a progress bar?

[sabbaka]

It's not hard at all, it will be next step, just to add event on click and a bit more logic, but I already have the idea how to make it and I've had this functional while doing WIP, so should be simple.

[spbnick]

I mean to make the control look like a slider not a progress bar, not to act like one (which is of course also necessary).

[sabbaka]

Oh yes, that's for sure, design will be changed after I'll consider some other options.