Enhancement: Clean up temporary files from codeserver when stopping Development mode

[jonl-percsolutions-com]

Currently, when stopping development mode, there is no clean up of temporary files in the temporary folder. I recently cleaned up my temporary directory on my dev vm and ended up removing about 7.5GB of data in gwt-codeserver directories. It would be nice, if possible, if the Development mode would clean up the temporary working directories when stopping.

[branflake2267]

Good idea.

[andersforsell]

I spent over an hour cleaning up millions of files in my temp directory left by GWT so this would be a very good feature if possible...

[pedjapesic]

Agree @andersforsell, this is the most annoying thing ever.

[mpcallahan]

For me these temp files cause serialization issues when I create new classes used in RPCs. GWT doesn't include the new classes in the serialization policy until I clear the temp files -- then it works.