Add 1.5.2 obf <-> srgnames mappings

Based on MCP 7.51 prerelease + FML 5.2.4.644:

cp ../FML/mcp/conf/packaged.srg 1.5.2/obf2numpkg.srg
cp ../FML/mcp/conf/joined.srg 1.5.2/obf2num.srg
py reverse-srg.py < 1.5.2/obf2num.srg | sort > 1.5.2/num2obf.srg
py reverse-srg.py < 1.5.2/obf2numpkg.srg | sort > 1.5.2/numpkg2obf.srg

https://github.com/MinecraftForge/FML/tree/c0cca7f41d5b080e39dd8d3d6cfc329295c822e6/conf
Ignore extracted jars
Add 1.5.2 CB <-> repackaged srgnames for FML runtime deobf

py chain.py 1.5.2/obf2numpkg.srg 1.5.2/obf2cb.srg | sort > 1.5.2/cb2numpkg.srg