[PATCH 4/4] gdiplus: fixes for font collection to save the fullname of fonts

[Esme Povirk (she/they)]

I would like to see some tests for this. The existing test_long_name
function should be a good place to add them.

I'd like the tests to verify that GdipCreateFontFamilyFromName works
now, and that GdipGetFamilyName and GdipGetLogFontW return the correct
names, since all of these are affected by changing the stored
FamilyName.