Reduce number of categories and minimum size of preferences

Merges the Project, Qt4 and Tool Chain categories into one Build & Run
category, which makes it finally possible to reduce the minimum height
of the preferences dialog.

Change-Id: I8d94aac9c9531200f5d8ca212a53d3edc5734138
Reviewed-on: http://codereview.qt-project.org/5023
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Daniel Teske <daniel.teske@nokia.com>

src/plugins/coreplugin/core.qrc

@@ -47,7 +47,6 @@
         <file>images/category_core.png</file>
         <file>images/category_texteditor.png</file>
         <file>images/category_help.png</file>
-        <file>images/category_project.png</file>
         <file>images/category_design.png</file>
         <file>images/category_qt.png</file>
         <file>editormanager/BinFiles.mimetypes.xml</file>
@@ -65,6 +64,7 @@
         <file>images/category_cpp.png</file>
         <file>images/category_vcs.png</file>
         <file>images/category_qml.png</file>
-	<file>images/filtericon.png</file>
+        <file>images/filtericon.png</file>
+        <file>images/category_buildrun.png</file>
     </qresource>
 </RCC>

src/plugins/coreplugin/dialogs/settingsdialog.cpp

@@ -393,7 +393,7 @@ void SettingsDialog::createGui()
     mainGridLayout->addWidget(buttonBox,        2, 0, 1, 2);
     mainGridLayout->setColumnStretch(1, 4);
     setLayout(mainGridLayout);
-    setMinimumSize(1070, 680);
+    setMinimumSize(1000, 550);
 }
 
 SettingsDialog::~SettingsDialog()