CLI: Internal cleanup refactor

Deletes some unnecessary code (#53).

Make Equals concurrent safe

Any updates to global deep settings are now wrapped in a mutex to prevent triggering the race detector.

CLI: Fix paths for v2+ packages

If a mock is generated for a v2+ package, it will now be a usable package path. For example, github.com/hello/world/v2 is generated as github.com/hello/world/v2/mock_world.

Internal changes related to CLI release

Merge pull request #48 from JosiahWitt/cli-v2

CLI mock generation refactor

CLI: Refactored mock generation

Now the ensure CLI is included in the ensure repo. This release contains a refactor of the ensure mocks generate command resulting in a huge performance boost. Instead of relying on the mockgen CLI, which generates several tiny programs that use reflection, it leverages Go's AST parsing package.

A few breaking changes to note for the ensure mocks generate command:

• --disable-parallel flag has been removed, since the CLI doesn't run anything in parallel anymore
• tidyAfterGenerate in .ensure.yml now defaults to true instead of false
• ensure generate mocks alias to ensure mocks generate has been removed

Expose the original *testing.T with ensure.T()

Now calling ensure.T() returns the type *testing.T instead of an interface.

Improve silenced panics

Learn more: #46

Nested ensure.New support

Allow created a new instance of ensure with a different testing context when th ensure package has been shadowed by the ensure variable.

For example:

ensure := ensure.New(t)

// ...

t.Run("important tests", func(t *testing.T) {
  ensure := ensure.New(t)

  // ...
})

Add MatchesAllErrors Chainer

To validate than an error is multiple errors, use:

ensure(err).MatchesAllErrors(user.ErrCreateUserFailed, store.ErrPutItemFailed)

Make Equals stricter and add MatchesRegexp chainer

• Now Equals treats nil and empty maps and slices as not equal (maybe a slight breaking change, but is safer)
• MatchesRegexp chainer added to allow matching strings against regular expressions