[gtk/wip/baedert/for-master] (93 commits) ...Make dimension values and calc values just number values

[Timm Bäder <baedert src gnome org>]

Summary of changes:

  7f97547... frame: Add a child property (*)
  1706b80... Use gtk_frame_set_child throughout (*)
  25826ea... frame: Derive from GtkWidget (*)
  e137152... aspectframe: Add a child property (*)
  1f63896... Use gtk_aspect_frame_set_child throughout (*)
  5b06b08... aspectframe: Derive from GtkWidget (*)
  4a133b4... fishbow: fixup premature popover (*)
  71433d0... aspect frame use fixup (*)
  937c94b... viewport: Add a child property (*)
  e9ddf0f... Use gtk_viewport_set_child throughout (*)
  e098ffb... viewport: Derive from GtkWidget (*)
  ee284a5... popover: Add a child property (*)
  8e26105... Use gtk_popover_set_child throughout (*)
  ee1f8d8... popover: Derive from GtkWidget (*)
  54b6133... scrolledwindow: Add a child property (*)
  67759d4... Use gtk_scrolled_window_set_child throughout (*)
  9d7b77f... scrolledwindow: Derive from GtkWidget (*)
  04e4a02... button: Add a child property (*)
  af6e0ee... Use gtk_button_set_child throughout (*)
  183431c... checkbutton: Modernize (*)
  07441ad... css tests: Update expected results (*)
  97d0e8c... css testsuite: Remove an obsolete test (*)
  4aa5fba... button: Derive from GtkWidget (*)
  b9b1bf8... window: Add a child property (*)
  f59f355... Use gtk_window_set_child throughout (*)
  9a65ed9... window: Derive from GtkWidget (*)
  686be57... revealer: Add a child property (*)
  649ae63... Use gtk_revealer_set_child throughout (*)
  41322e2... revealer: Derive from GtkWidget (*)
  b8d1a9e... flowboxchild: Derive from GtkWidget (*)
  12ecbd1... listboxrow: Derive from GtkWidget (*)
  e2abe6d... searchbar: Add a child property (*)
  99ef14b... Use gtk_search_bar_set_child throughout (*)
  3a9883b... searchbar: Derive from GtkWidget (*)
  53f9737... overlay: Add a child property (*)
  77af8e3... Use gtk_overlay_set_child throughout (*)
  edd5d36... overlay: Derive from GtkWidget (*)
  b96d7b6... Add gtk_overlay_remove_overlay (*)
  e2781af... testgtk: Fix g_object_new use (*)
  44f9a51... testkineticscrolling: Make this work again (*)
  5d26af0... combobox: Add a child property (*)
  ec394e8... Use gtk_combo_box_set_child throughout (*)
  aae25c4... combobox: Derive from GtkWidget (*)
  0ec5a3f... tooltipwindow: Derive from GtkWidget (*)
  dec5707... builder-tool: Convert former bin children (*)
  d8e4738... Add a test for bin child conversion (*)
  fa848e9... gtk-demo: Port blur demo from GtkBin (*)
  8d0773f... inspector: Derive recorder from GtkWidget (*)
  cac514f... testtooltips: Derive demo from GtkWidget (*)
  3c165b3... Drop GtkBin (*)
  17c2151... testsuite: Update a testcase (*)
  4735d38... docs: Fixup for an uninitialized variable (*)
  d827fe7... Adwaita: old style toolbar buttons (*)
  642924a... Merge branch 'wip/jimmac/oldstyle-toolbars' into 'master' (*)
  774d61c... Adwaita: notebook tab focus ring (*)
  b74a3de... Merge branch 'bin-removal' into 'master' (*)
  4cdb9ed... Merge branch 'wip/jimmac/notebook-tab-focus' into 'master' (*)
  7906f09... windowcontrols: Unparent children in dispose rather than fi (*)
  8effa10... searchbar: Drop the Private struct (*)
  a9103cc... placesview: Drop the Private struct (*)
  cda1a25... assistant: Drop the Private struct (*)
  e33da18... window: Lower the visible focus timeout (*)
  88e890c... widget-factory: Remove unused css (*)
  0070cff... widget-factory: Use symboli icons in the toolbar (*)
  d2b55df... Merge branch 'wip/exalm/controls-dispose' into 'master' (*)
  539f061... Merge branch 'misc-cleanups' into 'master' (*)
  e0f9584... actionbar: Use dispose instead of destroy (*)
  37e381e... combobox: Use dispose instead of destroy (*)
  1b44a64... expander: Use dispose instead of destroy (*)
  03f145e... filechooserbutton: Use dispose instead of destroy (*)
  4c7cafd... label: Use dispose instead of destroy (*)
  8683925... modelbutton: Use dispose instead of destroy (*)
  7639d3d... text: Use dispose instead of destroy (*)
  9f4cea1... viewport: Use dispose instead of destroy (*)
  c8066bc... spinbutton: Use dispose instead of destroy (*)
  c60ffee... range: Use dispose instead of destroy (*)
  8baefaf... radiobutton: Use dispose instead of destroy (*)
  49fcf41... shortcutssection: Use dispose instead of destroy (*)
  d2cbc45... iconview: Use dispose instead of destroy (*)
  d46252c... notebook: Use dispose instead of destroy (*)
  327da3d... statusbar: Use dispose instead of destroy (*)
  3d4bb76... textview: Use dispose instead of destroy (*)
  401f8a7... treeview: Use dispose instead of destroy (*)
  77d15b1... window: Use dispose instead of destroy (*)
  82f4b16... printunixdialog: Use dispose instead of destroy (*)
  d03b152... placesview: Use dispose instead of destroy (*)
  1086acc... container: Use dispose instead of destroy (*)
  84944f1... gtk-demo: Use dispose instead of destroy (*)
  a4cfbec... widget: Drop the destroy vfunc (*)
  824c730... Merge branch 'abolish-destroy' into 'master' (*)
  b96509c... Merge branch 'wip/baedert/for-master' into 'master' (*)
  6fbd385... csscalcvalue: Avoid allocating memory in compute()
  3d6d217... Make dimension values and calc values just number values

(*) This commit already existed in another branch; no separate mail sent