Add the FloatCanvas demo modules

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxPython/Phoenix/trunk@73860 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
fix indentation

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxPython/Phoenix/trunk@73861 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Add section about wx.PyEvent and wx.PyCommandEvent

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxPython/Phoenix/trunk@73862 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Switch to new shortened wxEventType names.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxPython/Phoenix/trunk@73863 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775