message: MOD Use filename instead of ClassName
  ctor snippet use the filename without extension for ClassName,
  the user can continue to edit or modify it if necessary.
diff: "constructor": {
  "prefix": "ctor",
  "body": [
  - "${1:public} ${2:ClassName}(${3:Parameters})",
  + "${1:public} ${2:$TM_FILENAME_BASE}(${3:Parameters})",
  "{",
  " $0",
  "}"
  