Remove Singleton
At https://github.com/isocpp/CppCoreGuidelines/blob/master/CppCoreGuidelines.md#Ri-singleton
it says I.3: Avoid singletons
QtSprites is such a Singleton.
Remove it.
At https://github.com/isocpp/CppCoreGuidelines/blob/master/CppCoreGuidelines.md#Ri-singleton
it says I.3: Avoid singletons
QtSprites is such a Singleton.
Remove it.