string.match for regular expression usage

See #256, release log:

• 02b5784 by @yegor256: #256: fixed
• 85b1317 by @yegor256: #256: more tests
• 0233b71 by @yegor256: Merge branch 'master' of githu...
• da2bd02 by @nlchar: added int.toFloat
• c439a17 by @yegor256: objects
• bed77fe by @rultor: Merge branch '__rultor'

Released by Rultor 1.69.1, see build log