Update .editorconfig;

- Only apply to stuff in src folder.
- Add lua extension.
- Ignore lib folder.

Considering moving it into src or removing it completely.

.editorconfig

@@ -1,9 +1,16 @@
 # editorconfig.org
 root = true
 
-[*.{c,h}]
+[src/**.{c,h,lua}]
 charset = utf-8
 indent_style = space
 indent_size = 2
 insert_final_newline = true
 trim_trailing_whitespace = true
+
+[src/lib/**]
+charset = ignore
+indent_style = ignore
+indent_size = ignore
+insert_final_newline = ignore
+trim_trailing_whitespace = ignore