Closes#25
- Add `todos` swiftlint rule which detects `TODO:` or `FIXME:` without
ticket number.
- Use `TODO [#<issue number>]:` to not trigger this rule.
- Updated TODOs and FIXMEs which had issue number in different format in
the code.
- added words counter X/24
- added input for the birthday
- all kinds of validity check implemented
- unit tests for the whole import wallet business logic implemented
[301] Import Wallet does not have a Birthday input field (328)
- support for the birthday to be optional input
[301] Import Wallet does not have a Birthday input field (328)
- Int -> BlockHeight refactor