Bug fix: SurfaceVector/OsdVector: reference counts for style VectorHandles

Bug fix: SurfaceVector/OsdVector: reference counts for style VectorHandles

SurfaceVector::drawText() would only call getStyleRef(DrawStyle)
once per string drawn. This resulted in a ref count of 1 regardless
of how many chars were drawn. Each time Boxx:draw() was called,
surface->fillblt would call removeCommands which dereferenced 1 for
each character. This eventually results in ref counts of zero or
negative. The GC deletes the DrawStyle/VectorHandle mapping if the
ref count is exactly zero, meaning just sometimes a style is deleted
when it is to be used. When this happens text on screen disappears.

This *might* also be the fix for a Windows client crashing bug.