#587 Edit mode for Apple Swift programming language

[Wayne]

I have created an edit mode for Apple's Swift programming language, hopefully it is useful to Swfit guys.

Mode line in catalog file:
<mode name="swift" file="swift.xml" file_name_glob="*.swift"> </mode>

Mode defination file swift.xml as attached;

Example swift language file CmdLineArgumentParser.swift as attached.

[Wayne]

Example swift file to test the edit mode

[Matthieu Casanova]

Added in trunk, thanks