add support for codicons

[cstrahan]

Description

Add support for codicons (https://github.com/microsoft/vscode-codicons).

@all-contributors please add @cstrahan for code

Requirements / Checklist

• Read the Contributing Guidelines
• Read or at least glanced at the FAQ
• Read or at least glanced at the Wiki
• Scripts execute without error (if necessary):
  • If any of the scripts were modified they have been tested and execute without error, e.g.:
    • ./font-patcher Inconsolata.otf --fontawesome --octicons --pomicons
    • ./gotta-patch-em-all-font-patcher\!.sh Hermit
• Extended the README and documentation if necessary, e.g. You added a new font please update the table

What does this Pull Request (PR) do?

Add support for codicons (https://github.com/microsoft/vscode-codicons).

How should this be manually tested?

Perhaps. I have tested this in the gedit text editor as well as within neovim (from gnome-terminal) using the configuration here: https://github.com/onsails/lspkind-nvim

Any background context you can provide?

These are the same glyphs used by VSCode for Language Server icons (e.g. Enum, Member, Class, etc).

What are the relevant tickets (if any)?

Closes #620

Screenshots (if appropriate or helpful)

[cstrahan]

I'll note here that codicon.ttf is licensed under CC BY 4.0:

• https://github.com/microsoft/vscode-codicons/blob/main/LICENSE
• https://creativecommons.org/licenses/by/4.0/

[cstrahan]

And the symbol start/end code points were taken from here: https://raw.githubusercontent.com/microsoft/vscode-codicons/main/dist/codicon.csv

[ryanoasis]

This is great. I'll check it out

[ryanoasis]

Could you move it into a sub directory and also drop the license file in the same folder?

I made a similar recent change here: 9633b4d

[ryanoasis]

@all-contributors please add @cstrahan for code

[allcontributors]

@ryanoasis

I've put up a pull request to add @cstrahan! 🎉