Look to use wxAuiManager

[rmpowell77]

We should look to use wxAuiManager at some point to manage the screens in field_frame. They look pretty nice, are dock-able. It's something removing the wxSplitters and adding:

Would want to manage the layout after we do this so things stay in the right place.

    m_mgr.AddPane(mCanvas, wxAuiPaneInfo().Caption(wxT("mCanvas")).Center());
    m_mgr.AddPane(mContinuityBrowser, wxAuiPaneInfo().Caption(wxT("mContinuityBrowser")).Right());
    m_mgr.AddPane(mFieldThumbnailBrowser, wxAuiPaneInfo().Caption(wxT("mFieldThumbnailBrowser")).Left());
    m_mgr.InsertPane(mControls, wxAuiPaneInfo().Caption(wxT("mControls")).Bottom(), wxAUI_INSERT_DOCK);
    m_mgr.Update();

[rmpowell77]

This is addressed in 3.6.0 already