2.3.0

What's Changed

• Removed <rolly/functional/signals.h> header and all corresponding files by @whs31 in #9
• Added u128 type - 128-bit unsigned integer by @whs31 in #10
• Added fixed_string type and tests by @whs31 in #11
• Added ipaddress library as transitive dependency, re-exported ipv4_address, ipv6_address, ip_address types by @whs31 in #12
• Renamed <rolly/rolly.h> to <rolly/all.h> by @whs31 in #13

Full Changelog: 2.2.2...2.3.0