* LayeredErrorFrame: both the error frame and the list are now protected instead of private, letting any expanded classes take more control over the them. SetErrorFrameMessage(), AddListView() and the class destructor have been removed because of this change.
* LayeredErrorFrame: removed views vector and simplified the list element focus check carried out before switching to the error frame.
* core: implemented SCOPED_TRY_LOCK macro. Specific functions are now using it instead of SCOPED_LOCK to avoid potentially locking the Borealis UI.
* UI: implemented background tasks for Borealis, which call functions that now use SCOPED_TRY_LOCK.
These files will be modified to slowly add features from the nxdumptool rewrite codebase.
This commit effectively makes it impossible to build the previous PoC. The code from each PoC will be reused, though, so it hasn't been removed.
