Switch from Sublime-Inform grammar to language-inform7 grammar

for Inform 7 source code.

.gitmodules

@@ -701,3 +701,6 @@
 [submodule "vendor/grammars/language-renpy"]
 	path = vendor/grammars/language-renpy
 	url = https://github.com/williamd1k0/language-renpy.git
+[submodule "vendor/grammars/language-inform7"]
+	path = vendor/grammars/language-inform7
+	url = https://github.com/erkyrath/language-inform7

grammars.yml

@@ -103,8 +103,6 @@ vendor/grammars/Sublime-Coq:
 - source.coq
 vendor/grammars/Sublime-HTTP:
 - source.httpspec
-vendor/grammars/Sublime-Inform:
-- source.Inform7
 vendor/grammars/Sublime-Lasso:
 - file.lasso
 vendor/grammars/Sublime-Logos:
@@ -342,6 +340,8 @@ vendor/grammars/language-gfm:
 - source.gfm
 vendor/grammars/language-hy:
 - source.hy
+vendor/grammars/language-inform7:
+- source.inform7
 vendor/grammars/language-javascript:
 - source.js
 - source.js.regexp

lib/linguist/languages.yml

@@ -1510,7 +1510,7 @@ Inform 7:
   extensions:
   - .ni
   - .i7x
-  tm_scope: source.Inform7
+  tm_scope: source.inform7
   aliases:
   - i7
   - inform7