API for checking resource files in current or other plugin.

I suggest that we should have API for checking resource files in current or other plugin is exist.

It is easy easy with os.path.isfile() when in ST2. But in ST3 the plugin may packed in a .sublime-package. Currently we only have find_resources() which is very limited (can only match file name part).

Maybe some API like:

sublime.resource_exists("Packages/<Plugin Name>/resources/name.ext")