R8 phase 1: extract app/engine shared utilities into shared/include/oakutil

Move the pure-header utilities shared by app/ and engine/ out of
engine/common/ into a new shared/include/oakutil/ layer (define, lerp,
decibel, digit, range, crashpadutils, autoscroll, qtutils, filefunctions
declarations, and a trimmed xmlutils exposing a CancelAtom-free void*
overload). engine/common/ keeps forwarding headers so internal include
paths are unchanged; app/ now includes oakutil/* directly.

engine/node/project.h gains an explicit NodeGroup forward declaration
previously obtained transitively through the old xmlutils.h.

app/widget/projectexplorer/projectexplorer.cpp

@@ -30,7 +30,7 @@
 #include <QUrl>
 #include <QVBoxLayout>
 
-#include "common/define.h"
+#include "oakutil/define.h"
 #include "core.h"
 #include "dialog/footageproperties/footageproperties.h"
 #include "dialog/proxy/proxydialog.h"

app/widget/projectexplorer/projectexplorericonviewitemdelegate.cpp

@@ -23,7 +23,7 @@
 
 #include <QPainter>
 
-#include "common/qtutils.h"
+#include "oakutil/qtutils.h"
 
 namespace olive
 {

app/widget/projectexplorer/projectexplorericonviewitemdelegate.h

@@ -24,7 +24,7 @@
 
 #include <QStyledItemDelegate>
 
-#include "common/define.h"
+#include "oakutil/define.h"
 
 namespace olive
 {

app/widget/projectexplorer/projectexplorerlistviewbase.h

@@ -24,7 +24,7 @@
 
 #include <QListView>
 
-#include "common/define.h"
+#include "oakutil/define.h"
 
 namespace olive
 {

app/widget/projectexplorer/projectexplorerlistviewitemdelegate.h

@@ -24,7 +24,7 @@
 
 #include <QStyledItemDelegate>
 
-#include "common/define.h"
+#include "oakutil/define.h"
 
 namespace olive
 {

app/widget/projectexplorer/projectexplorernavigation.cpp

@@ -24,7 +24,7 @@
 #include <QEvent>
 #include <QHBoxLayout>
 
-#include "common/define.h"
+#include "oakutil/define.h"
 #include "ui/icons/icons.h"
 
 namespace olive

app/widget/projectexplorer/projectexplorernavigation.h

@@ -27,7 +27,7 @@
 #include <QSlider>
 #include <QWidget>
 
-#include "common/define.h"
+#include "oakutil/define.h"
 
 namespace olive
 {

app/widget/projectexplorer/projectexplorertreeview.h

@@ -24,7 +24,7 @@
 
 #include <QTreeView>
 
-#include "common/define.h"
+#include "oakutil/define.h"
 
 namespace olive
 {

app/widget/projectexplorer/projectviewmodel.cpp

@@ -26,7 +26,7 @@
 #include <QMimeData>
 #include <QUrl>
 
-#include "common/qtutils.h"
+#include "oakutil/qtutils.h"
 #include "core.h"
 #include "oakengine/project.h"
 #include "oakengine/node.h"