Adds proper grammar for the DM language.

[PJB3005]

The DM language has been in Linguist for a long time, but always used the C++ lexer.

@seiyria

[pchaigno]

The grammar is missing a license ;)
Could you also show the improvement, using Lightshow, on this DM sample (or any other sample)?

[PJB3005]

Alright amended to add a license, gonna work on showing the difference.

[PJB3005]

Uhm, Lightshow is giving me the following error when trying to use it:
Error parsing YAML grammar: (<unknown>): did not find expected ',' or ']' while parsing a flow sequence at line 1 column 12

The grammar is an Atom CSON grammar but it's seeing it as YAML for some reason.

[pchaigno]

@PJB3005 See #2924 ;)

[PJB3005]

Alright I'll update the grammar to add quotes for Lightshow, then.

[PJB3005]

Before

After

[arfon]

Thanks for this contribution @PJB3005 ⚡. This will be live in the next release of Linguist (likely sometime in the next week).

[duncathan]

Oh this is lovely