[Projects/Dub] Added global dub settings manager.
[Building/LowLevel] Made ExecuteProgram() be able to proceed without a given monitor
.
[Meta] Corrected wrong MD debug path, again
[Projects/Dub] Refactored package.json load procedures; Load external package paths via executing dub list-installed while loading the project.
[Projects/Dub] Moved all the dependency path resolution to the DubReferencesCollection;
Added proper name representation to the 'References' folder in the project pad.
[Projects/Dub] Made dub project (package) configs be in debug state by default (probably good for debugging purposes)