Bump migrations to v2.x

[Jeckerson]

Update from v1 to v2 and check if all works.
Also check if migrations from v1 are compatible with v2. If so, release it with devtools v4.1 instead of v5.0

[BeMySlaveDarlin]

Migrations v1 and v2 compatibility tests

• Mysql (tested: percona, mariadb, mysql 5.6 | skipped: mysql 8, mysql clustered, mysql master-slave scheme)
  • generate/run
  • all column types
  • morph, up, down
  • datasets
  • command options
• Postrgesql (tested: 9.6, 10-12 | skipped pg cluster)
  • generate/run
  • all column types
  • morph, up, down
  • datasets
  • command options

Common minor issues:

• Command calls different - v1 requires extra argument in call phalcon-migrations migration [command] [options]
• Minor differs in exception outputs
• Minor differs in cases of code parts
• v2 and devtools 4.0.x cannot be installed together