Nyall Dawson 4b014e6e84 Remove SIP convert to subclass code for QgsRubberBand and QgsVertexMarker
These conversions just crash sip (woo. sip. yay. good times.). I can't find
any alternative approach which avoids this crash, so just remove the cast
to avoid the crash.

Fixes #32700
2019-11-09 13:43:37 +10:00
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