JBIDE-14466 HTML5 img widget

New Image wizard is added. Test is added.
JBIDE-14676 Preview does not work on Mac OS

Preview in jQuery Mobile Palette wizards does not work on Mac OS.
Copied js and css resources to plugin state location.
Referenced them with protocol 'file:' instead 'jar:'.
BIDE-14616: remove parent.relativePath

* To avoid issue with sync of local parent & remote (Nexus) parent
* Make local build behave more like CI build