Super Dev Mode: copy GWT-RPC policies to launcherDir

Also, fix a bug setting the wrong module base directory
when using bookmarklets and the code server has just
restarted.

This is so that policy files show up in the same place
as they used to in DevMode, making gwt.codeserver.port
unnecessary in DevMode -superDevMode.

Change-Id: I87659ca2605b05078a3cc4b74ce72d6fcd04a14f
Review-Link: https://gwt-review.googlesource.com/#/c/9519/
8 files changed