Parse numeric information on the PNG filenames to guess a "code"

[Darío Cutillas Carrillo]

When dragging & dropping files, it would be would if Smart Fpg Editor "guesses" the code in which to insert based on the file title.

The following cases could be considered: * Number followed by space and then '-' * Number enclosed in "#" (following the convention of the filenames generated when dragging & dropping to the desktop)