ui::Button doesn't get the title renderer's font size with BMFont

[tankorsmash]

If you've got a Button in Creator with its BMFont Label's size set to 24, then import it into your project, then call button->setTitleText, the title renderer will get resized to 10, since that's the initial font size value when a Button is constructed.

A potential solution is in reader/CreatorReader.cpp#397, you could use label->getRenderingFontSize() to set the button->setTitleFontSize() but that's a protected method. Even setting the fontsize there directly via label->getBMFontSize messes with the rendering and appears to end up with a system font instead. Not sure how to solve this.