Added File > Import in which you choose a .contentproj file.
File and Build menu items now only appear as enabled when appropriate (eg, no save option if project is not dirty).
Project will now load even with broken references.
ContentItems with importers or processors which we fail to locate will now be shown as "missing".
Changing project references will now trigger content items to re-resolve their processor/importer type from the specified name.
Merge branch 'develop' into PipelineTool
Merge branch 'develop' into PipelineTool
Working on making PipelineProject.References editable.
PipelineProject.References now editable in a separate dialog (rich text box). Properly notifies the controller when it is modified.
Added automatic remapping from old "MG.." style processor names to new names.
Importing of XNA projects should now be fully functional.
Fixed sizing of the textbox which appears for editing references.
Removed unnecessary INotifyPropertyChanged interface on PipelineProject.
References which contain "Microsoft" are completely ignored when importing a project.
Improved version control diff/merge for mgbc files by starting each content item with a comment line containing its sourcefile (and it already ends with a line containing its source file, the /build command).
Reference edit dialog now will appear with a minimum size (was collapsed on itself if there were no references).
Moved the reference edit classes to a code file under \Windows since it contains winforms specific code.
References containing "monogamecontentprocessors" are now ignored.
Merge pull request #2458 from SickheadGames/PipelineTool

PipelineTool, Import XNA project