UnitTest failures

[sreich]

The unit tests have no way of running properly because they don't include test16.png, or "missingimage.png". These files aren't in the repo from what I could see, so I wasn't sure what they should be.

grep -Ri ".png"
UnitTest/Button.cpp: pButtonC->SetImage( L"test16.png" );
UnitTest/Button.cpp: pButtonD->SetImage( L"test16.png" );
UnitTest/ImagePanel.cpp: img->SetImage( L"gwen.png" );
UnitTest/ImagePanel.cpp: img->SetImage( L"missingimage.png" );
UnitTest/MenuStrip.cpp: pRoot->GetMenu()->AddItem( L"New", L"test16.png", "Ctrl + N" )->SetAction( this, &ThisClass::MenuItemSelect );
UnitTest/MenuStrip.cpp: pRoot->GetMenu()->AddItem( L"Load", L"test16.png", "Ctrl+L" )->SetAction( this, &ThisClass::MenuItemSelect );
UnitTest/MenuStrip.cpp: pRootB->GetMenu()->AddItem( "Two.Nine", "test16.png" );
UnitTest/MenuStrip.cpp: pRootB->GetMenu()->AddItem( "Six.Five", "test16.png" );
UnitTest/TabControl.cpp: pDragMe->AddPage( L"Reorder" )->SetImage( L"test16.png" );