fix: potential UAF in SysFont#15
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When a SysFont is duplicated (via copy constructor or
Duplicate()), the clone gets the same underlyingTrueTypeDatapointer. When one copy of the SysFont is destroyed, it frees the TrueTypeData and destroys the underlyingFT_Face.DrawStringstill access the FT_Face afterwards.It would be even better to make
TrueTypeDatathe RAII container forFT_Facebut that's too big of a change right now