Add 1.5 prerelease mappings generated from MCP 7.42

py chain.py ../mcp742-clean/conf/ - | sort > 1.5/obf2mcp.srg
py reverse-srg.py < 1.5/obf2mcp.srg | sort > 1.5/mcp2obf.srg
cp ../mcp742-clean/conf/server.srg 1.5/obf2num.srg
py reverse-srg.py < 1.5/obf2num.srg | sort > 1.5/num2obf.srg
Add 1.5 prerelease <-> CB 1.4.7 mappings

py chain.py 1.4.7/num2obf.srg 1.5/num2obf.srg | sort > 1.5/obf-to-obf147.srg
py reverse-srg.py < 1.5/obf-to-obf147.srg | sort > 1.5/obf147-to-obf.srg
py chain.py 1.4.7/num2cb.srg 1.5/num2obf.srg | sort > 1.5/obf-to-cb147.srg
py reverse-srg.py < 1.5/obf-to-cb147.srg | sort > 1.5/cb147-to-obf.srg