[Patch] Ui cleanups for Project View plugin

[Sean Harmer]

Hi All,

Please find attached a patch that makes some small ui changes to the Project 
View plugin. These are mainly related to the build set widget where I have 
moved the build set item manipulation buttons to be above the widget to save 
horizontal space and reduce the cluttered look (especially when there are 
adjacent docks open in the bottom dock area).

I have also replaced the QTableView with a QTreeView so that we get better 
behaviour when hovering over items. That is the whole row is highlighted by 
the style rather than a single cell.

I have also made the columns in the build set widget adjust themselves to 
their content whenever items are added or removed.

The only change in the outer widget's ui file is to remove an extraneous level 
of layout.

Please see attached screen-shot for how the project view plugin looks now.

Can somebody review and commit if it is OK please?

Thanks,

Sean
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