[ALOY-488] Orphan file cleanup deletes builtins and widget assets

During the compile process Alloy will attempt to remove files from the Resources directory that are no longer present anywhere in the "app" folder. Alloy searches a number of locations in the "app" folder to see if the file is an orphan or not. False negatives should be avoided as they will leave unused files in the project. False positives on the other hand are not really worrisome since those resources will be recreated on the next compile anyway. With that in mind, there are currently false positives for orphan file deletion for builtins and widgets. Builtins and widgets will be pulled in fresh each time. Again, this will not negatively impact a developer's build process or app in any way, it would just be more true to the logic if these files were left alone during the orphan cleanup phase.