[DF-4586] non-initialized variables in SystemTimer
DF-4601 fixed UI3dView visibility registration in UIControlSystem

UI3dView now correctly reports its visibility status to UIControlSystem
[DF-4600] Making FastName::AddRef thread safe
[DF-4633] Fix for double remove of UIPopup.
[DF-4633] remove assert. convert error to warning.
[DF-4616] add mutex on modifying sound groups
[DF-4616] fix GetSoundGroupVolume
[DF-4616] fix GetSoundGroupVolume
DF-4674 fixed split text to strings that got broken after merge
Merge branch 'to_master' of github.com:dava/dava.framework into to_master
merged to_master into development