Fix a conflict on menu shortcuts in demo app

Fix conflicting requests for Command-W and Command-T keyboard shortcuts.
We align our choices on those seen in Apple's Xcode:
- Command-W for closing tab, Command-Shift-W for closing window
- Command-T for 'New Tab', Control-Shift-Command-T for 'Show Fonts'

Author: barijaona

MMTabBarView Demo/MMTabBarView Demo/en.lproj/MainMenu.xib

@@ -11,7 +11,7 @@
             </connections>
         </customObject>
         <customObject id="-1" userLabel="First Responder" customClass="FirstResponder"/>
-        <customObject id="-3" userLabel="Application"/>
+        <customObject id="-3" userLabel="Application" customClass="NSObject"/>
         <menu title="AMainMenu" systemMenu="main" id="29">
             <items>
                 <menuItem title="MMTabBarView Demo" id="56">
@@ -90,7 +90,7 @@
                             <menuItem isSeparatorItem="YES" id="79">
                                 <modifierMask key="keyEquivalentModifierMask" command="YES"/>
                             </menuItem>
-                            <menuItem title="Close" keyEquivalent="w" id="73">
+                            <menuItem title="Close Window" keyEquivalent="W" id="73">
                                 <connections>
                                     <action selector="performClose:" target="-1" id="193"/>
                                 </connections>
@@ -338,7 +338,8 @@
                                 <modifierMask key="keyEquivalentModifierMask"/>
                                 <menu key="submenu" title="Font" systemMenu="font" id="388">
                                     <items>
-                                        <menuItem title="Show Fonts" keyEquivalent="t" id="389">
+                                        <menuItem title="Show Fonts" keyEquivalent="T" id="389">
+                                            <modifierMask key="keyEquivalentModifierMask" control="YES" command="YES"/>
                                             <connections>
                                                 <action selector="orderFrontFontPanel:" target="420" id="424"/>
                                             </connections>