Improve error message
Updated reference to md-addins
[Core] Improved perf of Project.Files.GetFile() and GetFileWithVirtualPath()

This actually improves loading of the MonoDevelop project for me by ~1 second.

Also really improves performance of the plist editor for a big customer's app.
[Core] Cleanup to previous commit
[Mac] #7738 - Modal Dialogs should prevent Xamarin Studio from closing
Update main/monodevelop.spec.in

- SPDX license specifications
- add missing dependencies
- update configure switches
- fix file listing
Merge pull request #240 from Mailaender/patch-2

fix RPM spec file
Updated nrefactory.

Contains some important completion fixes.
Renamed external/Mono.Cecil -> external/cecil.

Required for building NRefactory.
Fixed completion now showing overloads bug.
Updated references to xwt, md-addins
Fixed 'Bug 9536 - Tooltip shows incorrect type arguments '.
[build] Bump xwt
[build] Bump md-addins for activation fix
Bump md-addins for an android fix
Revert "[Core] Cleanup to previous commit"

This reverts commit d68282dd2ea1610f185259354cb3df4d1d546491.
Revert "[Core] Improved perf of Project.Files.GetFile() and GetFileWithVirtualPath()"

This reverts commit 5ac5a74482e98dcb23f65df240e893cd42b4970f.
[build] Bump xwt
[Ide] Report/show XWT unhandled exceptions
Fixed 'Bug 9561 - Error in source analysis'.