Bump Smartdown to v0.5.0 to get Snippets
Add snippets to simple Animal example flow
Import SPL snippets
Disable interpolation/calulations in SPL

Replace %{}, which does interpolation, with !{}, so they're not run, but
we can still regex them out easily.

- None of the calculations are implemented yet
- Some of the snippets reference answers they don't _seem_ to have been
  given while getting to that outcome
- Add an example outcome using snippets

These aren't implemented yet
Standardise radio buttons and checkboxes

• update gemifile
• add necessary js references and code
• add necessary class to the form labels

CSS styles for this can be found in static

https://www.agileplannerapp.com/boards/105200/cards/5197
Update to latest version of frontend toolkit
Remove radio button js and move to static to be shared across repos
simple birth/nothing outcome, with conditional

These could be distinct outcomes, but the copy/intent is so
similar i'd like to keep them conceptually grouped for now.

It's easier to work with fewer (though slightly more
complicated outcomes) and split them out later
remove gemilfe.lock conclict
Merge pull request #1085 from alphagov/standardise-radio-buttons-checkboxes

Standardise radio buttons and checkboxes
Add better_errors debugging gems

Provides a more readable/explorable stack trace on exception, and a REPL for
interograting the exception where it happened
Use human predicates from Smartdown for graph labels
With the exception of otherwise, which is missing the implementation until Smartdown is updated
Merge pull request #1131 from alphagov/better-errors

Add better_errors debugging gems
Merge pull request #1130 from alphagov/snippets

Add snippet support and import SPL snippets
Merge pull request #1132 from alphagov/fix-spl-visualize

Fix Shared Parental Leave visualization
Add missing full stop
Publish marriage abroad august amends
Merge pull request #1135 from alphagov/publish-marriage-abroad-august-amends

Publish marriage abroad august amends