feat(ui): calendar component

[artyorsh]

Please read and mark the following check list before creating a pull request:

• I read and followed the CONTRIBUTING.md guide.
• I read and followed the New Feature Checklist guide.

Short description of what this resolves:

• Implements calendar component

Notes:

• Expands some components to export corresponding ReactElement. This needs to be added to all exported components
• Removes Omit type because it was included in TS 3.5
• Needs documentation preview images

Closes #520

[artyorsh]

I love Intl

[sudomann]

I suppose the calendar component is ready to go, and it's just this conflict blocking the merge?

[artyorsh]

@sudomann we're keep working on it