notes:
was okay in windows
wnd position is not preserved on hiding via Close event now, requires extra handling, as in class RotateDialog or g_guiSettings (no much critical cases exist)
min max buttons aren't shown (when requested) in Ubuntu, shown in Windows; were shown for Qt::Window flag
m1 = assign model to selected entity nodes (shift + e to select nodes of group entities)
m1x2 = insert "misc_model" with given model
m1 drag = rotate model
Preferences.Model Browser: list of * separated folderToLoad/depth values, e.g. *models/mapobjects/99*maps/1*; */99* loads root
misc...
* entity inspector, entity list->'autofocus on selection' buttons: also do FocusAllViews() on clicking them
* focus on preferences treeview on 2nd+ call to make text search to work
* fixed WindowPositionTracker globally: minus many particular hacks, plus correct wnds positioning in Floating viewports layout
* fixed ToggleShown functionality: shown/hidden wnds states are saved and loaded correctly in Floating viewports layout
* also save/load XY and Cam viewports visibility states
* new preferences->layout icons
* fix: stop chaseMouseMotion on mouse button release
