Simplified labels related to build and run settings

Mainly removed the "Settings" part, since we don't use that in our
settings pages generally.

Also merged the build and run group boxes, since they both have only a
single checkbox currently. Easy enough to add more structure when
necessary.

src/plugins/projectexplorer/projectexplorersettingspage.cpp

@@ -52,7 +52,7 @@ QString ProjectExplorerSettingsPage::id() const
 
 QString ProjectExplorerSettingsPage::trName() const
 {
-    return tr("Build and Run Settings");
+    return tr("Build and Run");
 }
 
 QString ProjectExplorerSettingsPage::category() const

src/plugins/projectexplorer/projectexplorersettingspage.ui

@@ -6,15 +6,15 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>541</width>
-    <height>358</height>
+    <width>296</width>
+    <height>152</height>
    </rect>
   </property>
   <layout class="QVBoxLayout" name="verticalLayout_3">
    <item>
     <widget class="QGroupBox" name="groupBox">
      <property name="title">
-      <string>Build Settings</string>
+      <string>Build and Run</string>
      </property>
      <layout class="QVBoxLayout" name="verticalLayout">
       <item>
@@ -24,15 +24,6 @@
         </property>
        </widget>
       </item>
-     </layout>
-    </widget>
-   </item>
-   <item>
-    <widget class="QGroupBox" name="groupBox_2">
-     <property name="title">
-      <string>Run Settings</string>
-     </property>
-     <layout class="QVBoxLayout" name="verticalLayout_2">
       <item>
        <widget class="QCheckBox" name="buildProjectBeforeRunCheckBox">
         <property name="text">