Remove all trailing spaces

No real changes, just clean up sources by removing trailing spaces from
all the non-generated files.

This should hopefully avoid future commits mixing significant changes
with insignificant whitespace ones.

include/wx/osx/core/cfdictionary.h

@@ -119,7 +119,7 @@ public:
     {
         SetValue(key, wxCFNumberRef(v));
     }
-    
+
     CFMutableDictionaryRef CreateCopy() const
     {
         return CFDictionaryCreateMutableCopy(kCFAllocatorDefault, 0, this->m_ptr);