Moved hgpropmode & hgwrapperlink; Added hgpropsync

- Moved hgpropmode & hgwrapperlink from /uibase to /util
- Added hgpropsync
- Bug fixes in hgpropmode
Added uipanels/dialogex

* Dialogex: dialog figure with Ok/Cancel/Apply buttons
* Changes & Bug fixes in related classes: uiflowgridcontainer,
uipanelautoresize, uipanelex,