While working on the previous commit, I noticed Gtk.Scale specially
handles translator comments, but more importantly, that it does not put
non-translatable labels in its decompiled output.
This is wrong, as it's not unlikely that Gtk.Scale marks would use a
purely numeric string, which should not be lost upon decompilation.
Add a test for this case too.
Add more tags to the list of things the decompiler can handle. This
required some changes to track the containing object class in the
DecompileCtx, since some objects use the same tag names.
The improved support means we can test the decompiler on most of the
test suite. Any new test samples will by default be tested to ensure the
decompiler produces the original blueprint file.
Also, updated the decompiler to always use double quotes.
