shiboken2: AbstractMetaType: use QSharedData[Pointer]

Previously, shiboken2 kept AbstractMetaType by a raw pointer. The data
were copied numerous times by AbstractMetaType::copy() when adding the
inherited functions to a AbstractMetaClass or specializing templates,
sometimes with a bool flag indicating ownership.

To get rid of the copies and ownership issues, change the type
to be based on QSharedData[Pointer]. It can then be passed
around and treated like a C++ value type, with Qt sharing the
data when possible behind the scenes.

- Extract AbstractMetaType to a separate header/source
- Remove unused AbstractMetaType::setInstantiationInCpp()
- Remove unused member m_package
- Rewrite the comparison of AbstractMetaType which
  becomes relevant for checking/detaching to do a complete
  comparison. It was previously unused, intended for
  a different implementation of view types with special cases.
- Rework debug formatting
- Invalid meta types are indicated by the "Invalid" usage pattern
  instead of null pointers

Change-Id: Ic4b1feecafb4f0355f39e178c2703b104e45cf6c
Reviewed-by: Cristian Maureira-Fredes <cristian.maureira-fredes@qt.io>

0 files changed, 0 insertions, 0 deletions