Refactoring of PyQmlProxy: Part 2

[rozyczko]

Proxied methods in PyQmlProxy should be also split between multiple "subproxies" with their own logics. Communication should follow the already set up signal/slot mechanism in LogicController

[rozyczko]

This is the planned structure

• The main proxy is only used to instantiate the sub-proxies and the LC
• Sub-proxies handle communication/calls from QML
• Sub-proxies only communicate with their own Logic components and with the main proxy
• Sub-logics contain all the functionality for sub-proxy properties
• Sub-logics can access other sub-logics directly or by signaling through LC
• Logic controller listens to signals coming from sub-logics and coordinates inter-logics communication
• LC is owned (instantiated) by the main proxy. The proxy instantiates subproxies with the reference to LC, allowing subproxies to get access to their respective logics (shown subproxies/sublogics are just a subset, there is of course more components there)

[rozyczko]

Another approach has been implemented in proxies_test, without LogicController and with all the logic combined with subproxies.