Introjucer: Request Appending "juce::"

Hi Jules,

My projects work with DONT_SET_USING_JUCE_NAMESPACE set to 1… so designing components with the Introjucer is a total PITA because I have to go in and manually add “juce::” wherever necessary.

Therefore, I would like to request appending “juce::” in generated code automatically, if required.