Sync .editorconfig with dmd (#3449)

.editorconfig

@@ -1,9 +1,24 @@
+# EditorConfig file: http://editorconfig.org/
+
 root = true
 
-[*.{c,h,d,di,dd}]
-end_of_line = lf
+# Default settings for all file types:
+# + save files in UTF-8 encoding
+# + remove whitespace at the end of lines
+[*]
+charset = utf-8
 insert_final_newline = true
+trim_trailing_whitespace = true
+
+# File type specific settings:
+[*.{asm,S,c,m,d,di,dd,ddoc,dt,json,sdl,R,bat,bash,fish,sh,zsh}]
 indent_style = space
 indent_size = 4
-trim_trailing_whitespace = true
-charset = utf-8
+
+# Make and Windows module-definition files use tabs for indentation
+[*.{mak,Makefile,def}]
+indent_style = tab
+
+[*.{cpp,h,yml}]
+indent_style = space
+indent_size = 2