Implement value-range search in rafind2

[trufae]

in r2 there's /V to search for ranged values. but rafind2 only exposes the /v..

Reuse code if possible. about the commandline flags, its probably better to follow a different syntax, because -v stands for version

[qoelet]

Would it be a bad idea if we have -V represent both search types, i.e. -V 4:123 and -V 4:123,126?

[trufae]

Sounds like a good plan. This way we dont need more flags to handle both cases and looks readable to me