Refactored code for loading font from a .qfont file.

Now this is a separate constructor, not a static method.

As a side effect QFontLoaderConfiguration was deleted, QFontBuilderConfiguration is used instead
Removed UsingVertexBuffers variable since it is unneeded (always using them).

Cleaned up remnants to this variable in code - just commented for now but will be deleted in a future cleanup commit
Re-enabled drop shadows.

They use whichever render state is in use by the 'parent' QFont class
Cleaned up .csproj file
Updated readme

Updated Todo checklist

Removed UseVertexBuffer variable in Initialization example