Fixed the org.eclipse.wb.swt.SWTResourceManager issue

Title says it all. There was an issue with one of the imports. I think
I've fixed it now by creating the appropriate package and class.

I found the code for the class at
http://dev.eclipse.org/svnroot/tools/org.eclipse.windowbuilder/trunk/org
.eclipse.wb.ercp/resources/1.4/org/eclipse/wb/swt/SWTResourceManager.jav
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