Implement full RTL support

[grapoza]

I have no idea what the state of RTL support is for this component. It should become part of the implementation and tests. I'm guessing mostly just a bunch of new CSS.

[grapoza]

Technically any use of logical padding, margins etc. will be a breaking change for IE11. This won't be a problem after #208 is resolved in 4.0.0. Other browsers continue to improve their support of CSS logical properties, so instead of adding some [dir='rtl']-based CSS and reworking it with CSS logical properties later RTL support can be pushed back to the 4.0.0 project.