more selective editorconfig

- only apply config to C and D source files

.editorconfig

@@ -1,15 +1,9 @@
 root = true
 
-; Standard conventions for the D programming language repository are:
-;  no tab characters
-;  indents are by 4 spaces
-;  line endings are LF
-;  no trailing whitespace
-;  last character in file is an LF
-[*]
+[*.{c,h,d,di,dd}]
+end_of_line = lf
+insert_final_newline = true
 indent_style = space
 indent_size = 4
 trim_trailing_whitespace = true
-insert_final_newline = true
 charset = utf-8
-end_of_line = lf