Adds proper grammar for the DM language.

.gitmodules

@@ -701,3 +701,6 @@
 [submodule "vendor/grammars/nix"]
 	path = vendor/grammars/nix
 	url = https://github.com/wmertens/sublime-nix
+[submodule "vendor/grammars/atomic-dreams"]
+	path = vendor/grammars/atomic-dreams
+	url = https://github.com/PJB3005/atomic-dreams

grammars.yml

@@ -183,6 +183,9 @@ vendor/grammars/atom-language-stan/:
 vendor/grammars/atom-salt:
 - source.python.salt
 - source.yaml.salt
+vendor/grammars/atomic-dreams/:
+- source.dm
+- source.dmf
 vendor/grammars/ats:
 - source.ats
 vendor/grammars/awk-sublime:

lib/linguist/languages.yml

@@ -772,7 +772,7 @@ DM:
   - .dm
   aliases:
   - byond
-  tm_scope: source.c++
+  tm_scope: source.dm
   ace_mode: c_cpp
 
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