Automatically add final newline & trim whitespace

.editorconfig

@@ -3,7 +3,10 @@ root = true
 [*.{cpp,h,inl,cmake}]
 indent_style = tab
 tab_width = 4
+trim_trailing_whitespace = true
+insert_final_newline = true
 
 [CMakeLists.txt]
 indent_style = tab
 tab_width = 4
+trim_trailing_whitespace = true