Add Kotlin icon

[Finii]

Description

Add Kotlin icon to Seti & Custom glyph source font.

Requirements / Checklist

• [x] Read the Contributing Guidelines
• [x] Verified the license of any newly added font, glyph, or glyph set

What does this Pull Request (PR) do?

Add a hand drawn Kotlin icon to the original-source font.

How should this be manually tested?

Any background context you can provide?

What are the relevant tickets (if any)?

Feature request #861

Screenshots (if appropriate or helpful)

[Finii]

This clashes with #833 - codepoints 'overlap'

And I wonder still ... is there no automaton for original-source.otf? :-/

[danielcherubini]

Is there anything that needs help on this? It would be great to get this icon in there

[Finii]

Still busy with Release 2.2.x aftermath. Lets wait a bit before working on new additions.

[Finii]

Rebase on master - needed to shift codepoint of new glyph - force push