[planner] (61 commits) ...Merge branch 'gtk3-port-prep' into 'master'

[Mart Raudsepp <mraudsepp src gnome org>]

Summary of changes:

  c0b282c... Drop unused UI files
  ad08ec8... Migrate to GSettings
  0d07a12... Simplify gconf to GSettings migration handling
  47ee40d... Fix typo in a schema key description from the gconf convers
  e9144cf... build: Depend explicitly on libxslt for msp-plugin
  d2cca61... Migrate from libglade files to GtkBuilder resources
  5aaf672... task-date-widget.ui: Adapt away from display_options custom
  15669eb... task-date-widget.ui: Drop placeholder GtkWindow
  28ff01d... ui: Drop GtkDialog.has_separator property setting
  5fce94f... Switch from GtkComboBoxEntry to GtkComboBox
  2f562cf... planner-usage-row: Drop unused #include "eel-canvas-rect.h"
  b56235d... eel-canvas-rect: Drop unused HAVE_RENDER code paths
  32a53fc... eel-canvas-rect: Move away from gdk_pixbuf_render_to_drawab
  89fb9dd... eel-canvas-rect: Port gdk_draw_pixbuf to cairo
  dccd409... eel-canvas-rect: Port gdk_draw_rectangle to cairo
  a827e16... eel-canvas-rect: Drop now unused rgba to GdkGC mapping and 
  d0b76dc... eel-canvas-rect: Drop now no-op realize/unrealize vfunc ove
  0e0d912... Fix various theoretical GtkListStore memory leaks
  530ead8... calendar-dialog: Port day type selector from GtkOptionMenu 
  ef24879... default-week-dialog: Port weekday selector to GtkComboBoxTe
  4136e98... default-week-dialog: Port day type selector to GtkComboBox
  1d10d16... project-properties: Port phase selector to GtkComboBoxText
  b0308dd... planner-task-popup: Port to GtkUIManager
  b72ab21... util: Move menu_position_on_current_cell to a util function
  15bf812... usage-tree: Port from GtkItemFactory to GtkUIManager
  a43ca47... resource-view: Port popup menu to existing GtkUIManager
  9600546... new-property: Port property type selector to GtkComboBox
  3881c20... resource-dialog: Port group selector to GtkComboBox
  cff94c3... resource-dialog: Port type selector to GtkComboBoxText
  a0dc7c9... resource-input-dialog: Port group selector to GtkComboBox
  68cf715... cell-renderer-date: Port constraint chooser to GtkComboBoxT
  426b10a... task-dialog: Port add-predecessor relation chooser to GtkCo
  7918724... gantt-chart: Port object instantiation from GtkType to GObj
  5dd78b0... gantt-chart: Port from gtk_object_sink to g_object_ref_sink
  cd4e259... gantt-header: Port away from GtkObject
  ade8abc... usage-chart: Port from gtk_object_sink to g_object_ref_sink
  6c1af2a... build: Pass GLIB_VERSION_{MIN,MAX}_REQUIRED for compilation
  31fa7ef... Replace GDK_<keyname> with GDK_KEY_<keyname>
  28fb503... Drop usage of deprecated gdk_drawable_get_size
  6553a95... usage-row: Port to cairo drawing
  9166daa... gantt-header: Port to cairo drawing
  72faf8b... gantt-row: Drop unused break_gc and break_stipple
  cad636c... planner-calendar: Drop and use GtkCalendar instead
  fbfb1a0... gantt-background: Port to cairo drawing
  2c0ce47... relation-arrow: Drop unused USE_AFFINE code
  ac1d7ac... relation-arrow: Port to cairo drawing
  4627bef... gantt-row: Port to cairo drawing
  2f63a0a... charts: Drop usage of gdk_color_white()
  13ffeed... Use accessor functions (GSEAL) for straightforward cases
  23d6e64... Use accessor functions for widget GtkStyle (GSEAL)
  b9fdc9b... planner-window: Make use of GtkMessageDialog secondary text
  2179b56... resource-view: Port resource type cell to GtkCellRendererCo
  408a796... resource-view: Port resource group cell to GtkCellRendererC
  3270cc3... task-dialog: Port relation type cell to GtkCellRendererComb
  9d05b45... task-dialog: Drop remaining unnecessary PlannerCellRenderer
  4a60ffc... planner-cell-renderer-list: Drop as now unused
  2bdcf2c... cell-renderer-popup: Use properties instead of GTK3 sealed 
  92614c4... popup-entry: fix direct access issue for entry widget in ce
  1b5992c... gantt-header: Set the widget allocation in size_allocate im
  91384a1... sidebar: Port away from GtkObject
  e59744f... Merge branch 'gtk3-port-prep' into 'master'