GoogleDriveResolveIdRequest gets a lowercase path and searches for the
specified file's id. To do that it lists path's subdirectories one by
one with GoogleDriveListDirectoryByIdRequest.
GoogleDriveListDirectoryByIdRequest gets a Google Drive id and lists
that directory (not recursively).
It's shown by SaveLoadChooserDialog when files are downloaded and some
save slots are locked. One can hide that dialog to interact with
non-locked slots or cancel saves sync completely. Dialog's label shows
current sync progress.
Dialog automatically hides itself when all files are downloaded.
WARNING: right now that results in a crash!
It has its own GoogleDriveTokenRefresher and knows how to do info().
This commit also contains JSON int -> long long int fix and
CurlJsonRequest '\n' -> ' ' fix.
Alexander Tkachev