Rewrite IPAddr.new.include? with pure Ruby bit operation

[hsbt]

I want to reduce across stdlib dependencies. I remove IPAddr and rewrite that to rough bit operation.

[knu]

I'm not particularly in favor of implementing another IP address parser to maintain.

Leaving aside the maintenance cost, there would be concerns about regression and incompatibility. I think the new implementation has to be tested with all IP address patterns that IPAddr can handle in the test suite, and it also has to reject invalid addresses that IPAddr rejects.

[knu]

it also has to reject invalid addresses that IPAddr rejects.

Maybe this is not a strict requirement because it silently ignores any malformed address and returns false.

[hsbt]

@knu Thanks, I also agree your comment. I added only simple IPv4 and IPv6 pattern. I keep open this until another idea will be available.