[Player] Create our own sliders

[paulhobbel]

Description

The player clearly needs some sliders, one for the time and one for the volume. The time slider will have to be customized anyways, but the volume slider could work perfectly with the slider "provided" with material-ui. However since material-ui@next does not provide a silder yet callemall/material-ui#4793 we will have to come up with something else:

• Copy the old Silder component from material-ui@v0 and tweak it to work with v1
• Use rc-slider as mentioned in the issue above
• Write them ourselves completely

[paulhobbel]

@UnknowAI what about using the LinearProgress component as base for the time slider.

[paulhobbel]

Closing old issues