QmlDesigner: Update design on widget tool bars

* Add more style definitions in CSS
* Add CSS to curve editor, timeline and transtion editor tool bar
* Add spaces to curve and transition editor tool bar
* Fix icons and margins in form editor tool bar
* Remove inline CSS from nevigator search widget

Change-Id: I21467783ad491d5c3ba646e6b3ac2d95b47e5fb5
Reviewed-by: Brook Cronin <brook.cronin@qt.io>
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>

src/plugins/qmldesigner/components/curveeditor/curveeditor.cpp

@@ -8,6 +8,8 @@
 #include "detail/graphicsview.h"
 #include "detail/treeview.h"
 
+#include <utils/fileutils.h>
+
 #include <QDoubleSpinBox>
 #include <QHBoxLayout>
 #include <QLabel>
@@ -32,6 +34,9 @@ CurveEditor::CurveEditor(CurveEditorModel *model, QWidget *parent)
     m_infoText = new QLabel(labelText);
     setContentsMargins(0, 0, 0, 0);
 
+    m_toolbar->setStyleSheet(Theme::replaceCssColors(
+        QString::fromUtf8(Utils::FileReader::fetchQrc(":/qmldesigner/stylesheet.css"))));
+
     auto *splitter = new QSplitter;
     splitter->addWidget(m_tree);
     splitter->addWidget(m_view);