Fix binlogs not available for design time builds

VS Mac was changed so that design time builds when run about the
same time use a single temporary build session. This meant the
project system tools extension's attempt to set a custom binlog
path would not work.

Fix this by changing all msbuild operations to be treated as long
operations instead of short operations. This prevents a shared
temporary build session being used and allows the custom binlog path
set by the project system tools extension to work. Whilst this may
slow down the builds, and mean they are run slightly differently,
having the binlogs created separately for each design time build
is more useful.

src/MonoDevelop.ProjectSystem.Tools/MonoDevelop.ProjectSystem.Tools/MSBuildTargetMonitor.cs

@@ -70,6 +70,12 @@ public ProgressMonitor GetProgressMonitor (ProgressMonitor monitor)
 			// Generate a bin log file.
 			context.BinLogFilePath = buildTarget.BinLogFileName;
 
+			// Ensure that a binlog is generated by using a LongOperations.
+			// ShortOperations run in a temporary build session and share a single
+			// binlog which is not supported by project system tools. Using
+			// LongOperations ensures a binlog is created for each msbuild target.
+			context.BuilderQueue = BuilderQueue.LongOperations;
+
 			progressMonitor = new MSBuildTargetProgressMonitor (buildTarget.LogFileName);
 			aggregatedMonitor.AddFollowerMonitor (progressMonitor, progressMonitor.Actions);