Compatibility: add a way to import an entire Raccoon v3 archive about raccoon4

[IzzySoft]

File|Convert menuitem (someone please suggest a better name

„File|Migrate“ might be more appropriate. Cannot suggest a „better“ tooltip text as I don't know the current one 😇 But maybe something like „Import your existing v3 archive“?

[onyxbits]

On second thought... doing it this way is utterly idiotic! Checking if there is something that could be imported just increases startup time (I'm obsessed with speed there) and requires a lot of code/work for something that is destined to fade into obscurity fast. I think, we are better off with an import script or something. In the long run, there needs to be a control in the App browser anyway through which the user can select how to update an an app (or to lock it from being updated at all).

[IzzySoft]

Technically, that has only to be checked on the first start. Then set an internal variable (which was initialized with NULL) to either TRUE (found something to import/migrate) or FALSE (nothing there). Once everything has been imported, it could be set to FALSE as well.

On the other hand the question is: is that worth the trouble? Why not simply have a menu item to check for an old installation, and decide then? Not enough space for that? 😸

[onyxbits]

Well, I just don't like that 10ms speed penalty on startup, everyone would have to pay in order to check if the item needs to be shown or not. Beyond that, doing this import thing is a giant PITA. Especially when OBB files get involved and everything needs to be hooked into the transfermanager (total overkill).

The stupid thing here being: the File|import dialog already supports multi file selection. The only thing thats missing is associating glueing together app id and profile id in a junction table. One could easily do that with a text editor in raccoondb_4.script:

INSERT INTO PLAYAPPOWNERSHIP VALUES(42,'my-profile')

[onyxbits]

Done