Version 1.2

Highlights:

• Added W_OBJECT_IMPL_INLINE / W_GADGET_IMPL_INLINE / W_NAMESPACE_IMPL_INLINE (#51)
• Fix multiple-definition linker errors caused by W_NAMESPACE macro (#54)
• Fix build with MSVC 2019 (#46)
• Massive compile time improvements (#66)
• Qbs project files (#63)
• Tested with to Qt 5.13