Load All Dependencies

Because right-click "Load Project Dependencies" only does half a job, and because computers are better at walking trees than humans are … LoadAllDependencies will calculate the complete set of dependent projects necessary for the selected project to compile and load them all. Only tested with .csproj, .fsproj, .vbproj, .vcxproj and .sqlproj project files, other project types should work if they store their references in /Project/ItemGroup/ProjectReference in the same format as the project files listed.