Add RTL support

[gincher]

Issue: #670

I have created example-dev-rtl.html with Hebrew in the editor to be able to test the RTL. To make the editor RTL, the user should add to the config {direction: 'rtl'}.

Tasks done:

• Modify CSS to support RTL
• Calculate distance from the right for the tooltip
• Right and left keys will move the user between blocks correctly
• Inline URL input field will remain LTR

[hoseinz3xs]

@neSpecc @khaydarov @gohabereg Could you please review this feature? I definitely wanna this one

[neSpecc]

@hoseinz3xs sure, we will review it soon.

[gincher]

• Flipper now works correctly with the keyboard arrows when RTL
• Conversion window now appears on the right side

Sorry for the mess, accidently I was working on the master branch, but it looks like there is no problem

[r6m]

@neSpecc any updates on this feature?

[neSpecc]

@rezam90 we'll try to include it to the next release.

[kfirba]

@neSpecc Is there any ETA as of when will this be merged? This seems like the only missing piece so we can use the editor in production :)

[neSpecc]

@kfirba May — June

[kfirba]

@neSpecc oh wow, that was a snappy response. Thanks!

Is it guaranteed that RTL support is coming in the next version?

[khaydarov]

@gincher could you re-open your PR, please? It seems to be unavailable

[arfrix]

I'll need that too