[Rpm-maint] [rpm-software-management/rpm] Add shorthand macros for some conventient Lua string operations (PR #2181)

[Panu Matilainen]

Yet another question is whether it'd be saner to just do to do a native Lua call doString() directly. It'd be a few lines more probably but then we could give saner error messages, eg

> $ ./rpm --eval "%sub x"
error: lua script failed: [string "sub"]:1: bad argument #2 to 'sub' (number expected, got no value)

The rest of the message is entirely reasonable but the "lua script failed" part is somewhat disorienting...

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