.editorconfig: bunch of additions

Formats:
- Restructured Text
- JSON
- MarkDown

Specific Files:
- .ecrc
- CMakeLists.txt

Ignore:
- /patches/ directory, we will not be editing foreign patches for their
  indentation

.editorconfig

@@ -7,10 +7,30 @@ insert_final_newline = true
 indent_style = tab
 charset = utf-8
 
-[*.yml]
+[/patches/**]
+indent_style = unset
+indent_size = unset
+
+[*{.json,.ecrc}]
 indent_style = space
 indent_size = 2
 
+[*.md]
+indent_style = space
+indent_size = 4
+
 [*.py]
 indent_style = space
 indent_size = 4
+
+[*.rst]
+indent_style = space
+indent_size = 3
+
+[*.yml]
+indent_style = space
+indent_size = 2
+
+[CMakeLists.txt]
+indent_style = space
+indent_size = 2