Color for slide toggle not active

[guilhermejcgois]

Is your feature request related to a problem? Please describe.
Sometime I need to set a color for unchecked state, or use the slide-toggle in RTL mode.

Describe the solution you'd like
A new input like color, but to set a custom color for slide-toggle when it is in an unchecked state, or a RTL input to invert the toggle active side.

Describe alternatives you've considered
For the problem of unchecked color, I can achieve removing view encapsulation of the parent component to modify using CSS properties.
For the problem of RTL, I solved not using the title property and using instead a own span within the text and rotating the mur-slide-toggle by 180 degrees.

Additional context
N/A