Create independent Snakemake language

[SilasK]

Description

Snakemake language was included under python. this PR makes it an independent language under the parent language python.

Colour #419179 taken from the S in the Snakemake logo on https://snakemake.github.io/

Checklist:

• I am adding a new language.
  • The extension of the new language is used in hundreds of repositories on GitHub.com.
    • Search results for each extension:
      • .smk https://github.com/search?utf8=%E2%9C%93&type=Code&ref=searchresults&q=extension%3Asmk+NOT+nothack
      • Snakefile: https://github.com/search?q=filename%3ASnakefile+NOT+nothack&type=Code
  • I have included a real-world usage sample for all extensions added in this PR:
    • Sample source(s):
      • Tutorial
      • See previous.
    • Sample license(s): MIT
• I created a unique ID
• I have included a syntax highlighting grammar:
  I use python as before
• I have updated the heuristics to distinguish my language from others using the same extension.

[SilasK]

This is a folow up from #3953 and should interest @johanneskoester and maybe @nh13

[SilasK]

I removed the .smk extension from python. In this case there is no other language using this extension. isn't it?

[lildude]

Please add a .snakefile sample too.

[SilasK]

@johanneskoester is it ok to set https://g.co/kgs/r8SHNw as the snakemake color?

[lildude]

@johanneskoester is it ok to set https://g.co/kgs/r8SHNw as the snakemake color?

Maybe go for #419179 (vs your proposal of #33c68a) as it is the colour of the S in the logo on https://snakemake.github.io/ so it's a colour that can be traced to some sort of "branding"?

[SilasK]

@lildude I changed the color.

[SilasK]

@lildude I think I made all requested changes, didn't I ?

Please add a .snakefile sample too.

[SilasK]

💯 Thank you @lildude

[corneliusroemer]

Amazing stuff! I independently had that idea and opened an issue for it snakemake/snakemake#2153 but that was unnecessary :)

Does linguist cover syntax highlighting or is this somewhere else? Would be the next logical step to get it well supported across the internet. Maybe on highlight.js?

[SilasK]

@corneliusroemer Let's continue discussing on snakemake/snakemake#2153