GUI: RealModel is refactored

Mikhail Svechnikovrequested to merge
realModel into main

RealModel dependence from SessionModel was significantly reduced.

Real items were disconnected from RealModel's "root_item", they are stored in the vector now, not tree.

Read/write system of RealModel was simplified and made more explicit.

XML tags were localized: they are defined now in the same file with read/write methods.

RealModel and JobModel have much in common, so they should inherit some base class that will replace SessionModel. This is not done yet.

Edited by Mikhail Svechnikov

Merge request reports