WIP: FileDialog SetExtraControlCreator#1405

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RobinD42 wants to merge 5 commits intomasterfrom

filedialog-extracontrol

Commits on Jun 27, 2015

Implement SetExtraControlCreator for wx.FileDialog
Conrad Huang
committed

Commits on Jun 28, 2015

Check for SetExtraControlCreator callback failure
Conrad Huang
committed

Commits on Oct 11, 2019

Commits on Oct 16, 2019

Some tweaks and code reorg, and a note about why it isn't working so far...
RobinD42
committed