[#3933] - style usability improvements

1 ) when I add a style reference to the \'styles\' node in the \'Report Inspector\' pane, I would then expect to see any styles contained in the referenced .jrtx to appear in the drop down for \'style\' in the properties pane when applying a style to a control... but they dont show in the dropdown and I have to type it in...

2 ) it is kind of a pain to set style references on every element by digging through the properties... after adding my style template reference as mentioned above, it would be nice to see the contained styles show up as child nodes of that template node in the report inspector pane... ( would also be nice if they would appear in hierarchical layout honoring the \'parent style\' property ) and then be able to drag a \'style\' node onto an element to apply the style.... ( these enhancements may be more appropriate in the \'style library window\', but it would be nice to be able to do from both areas because it seems the \'styles library window\' is more of a \'per iReport installation\', so being able to apply from the report pane would be easier to keep configured in situations with multiple developers )