Extended XbimConvert to allow for the meshing of IfcFeature elements if required through command line flag.
Changed xbim geometry cache class to ignore errors on double inserted elements (this allows adding meshes at later time, considering that ifcProject is written to the db with each meshing).

git-tfs-id: [https://tfs.codeplex.com:443/tfs/TFS13]$/xBIM/XbimFramework/Head;C35547
ProfileResource perimeter extensions added (incomplete)

git-tfs-id: [https://tfs.codeplex.com:443/tfs/TFS13]$/xBIM/XbimFramework/Head;C35658
bugfix: variable name typo and further ProfileResourceExtensions methods for unified units of measure.

git-tfs-id: [https://tfs.codeplex.com:443/tfs/TFS13]$/xBIM/XbimFramework/Head;C35664
Updated some nuget packages and added avalondock to XbimXplorer for new window docking UI.
XbimXplorer now has configuration window and options to save settings (including last open files).
XbimXplorer now provides a basic  plugin extension system through interfaces (alpha).
XbimXplorer: some menus have been moved in the UI; will still need improvement.

Changes to LayerStyling in Presentation.
Renamed private variables to adhere to standards.
New XbimColour creation method from HSV.
Improved federation colour map.

git-tfs-id: [https://tfs.codeplex.com:443/tfs/TFS13]$/xBIM/XbimFramework/Head;C35842
XbimXplorer default backround color changed and minor other edits.

git-tfs-id: [https://tfs.codeplex.com:443/tfs/TFS13]$/xBIM/XbimFramework/Head;C35843
Efficiency improvement to EntitySelection

git-tfs-id: [https://tfs.codeplex.com:443/tfs/TFS13]$/xBIM/XbimFramework/Head;C35907
XbimIPersistIfcEntityCollection performance increase.

git-tfs-id: [https://tfs.codeplex.com:443/tfs/TFS13]$/xBIM/XbimFramework/Head;C35908
Merge remote-tracking branch 'tfs/default'