[Spike] Investigate existing QML object-creation compiler prototype

This is a stub task to track initial progress on QML object-creation compiler. The idea of this spike is to:

• Get a grasp of existing infrastructure and main ideas of QML->C++ compilation (looking primarily at Ulf-Simon's POC and Ulf's POC in qtdeclarative)
• Better understand the internals of QML <-> Qt <-> C++ interaction
• Kick start the work on the actual compiler

Honorable mentions:
Ulf's later patch to the qtdeclarative compiler