Introduce DMDirc base UI test with helper methods
Move utility classes into harness/ui package
Change-Id: Id70553a03baa43b02036524a577aaa9f791b795b
Reviewed-on: http://gerrit.dmdirc.com/1264
Automatic-Compile: DMDirc Local Commits <dmdirc@googlemail.com>
Reviewed-by: Chris Smith <chris@dmdirc.com>