Send file when nothing selected and context menu

Added the ability to source MEL file or import and reload python module. This sends the current view/file if nothing is selected via the same command. Added language detection to the command so removed the explicit language arg. This also allows for a single context menu item which was added.

Perhaps the language arg could stay in, but I couldn't quite figure out a single "Send to Maya" context menu item with it, plus it gets ignored with the language detection in the command.

Tested on Windows and Mac, but not on Linux.