remove org.conman.errno.strerror()

I have a better way of handling this---a more Lua-y way.
Use org.conman.process.sig[x] to print signal description

Instead of calling org.conman.process.sig.strsignal(), let's use an index
method instead.  More Lua-y.
It's luaL_Reg, not luaL_reg.
A renaming of items.  Plus, some code reformatting.
Rename some more functions.
Remove uuid stuff---it is its own project now.