Logging methods refactoring

It should be the only one method to make log messages to the LogView panel. Currently in the code you can find standard logs (qWarnings / qInfo / ...), qml logs and manual parsed string logs.

There was a comment from n.z. about using tr(...):
"If logs go in anything different from ASCII - this is broken. Given that higher up there is LogError with tr() function - this, somehow, should be changed. But that is out of scope of current change. "