Fixed export_svg.py to work with FlowGraphs and fixed several issues due to Python3
Fixed export_svg.py to work with FlowGraphs and fixed several issues due to Python3

joshwatson/binaryninja-api,joshwatson/binaryninja-api,joshwatson/binaryninja-api,Vector35/binaryninja-api,joshwatson/binaryninja-api,Vector35/binaryninja-api,Vector35/binaryninja-api,Vector35/binaryninja-api,Vector35/binaryninja-api,Vector35/binaryninja-api,joshwatson/binaryninja-api,Vector35/binaryninja-api