evaluate 1.0.0

• Setting ACTIONS_STEP_DEBUG=1 (as in a failing GHA workflow) will
  automatically set log_echo and log_warning to TRUE (#175).

• evaluate works on R 3.6.0 once again.

• evaluate() improvements:

  • Now terminates on the first error in a multi-expression input, i.e.
    1;stop('2');3 will no longer evaluate the third component. This
    matches console behaviour more closely.

  • Calls from conditions emitted by top-level code are automatically stripped
    (#150).

  • Result has a class (evaluate_evaluation/list) with a basic print method.

  • Plots created before messages/warnings/errors are correctly captured (#28).

• Handler improvements:

  • The default value handler now evaluates print() in a child of the
    evaluation environment. This largely makes evaluate easier to test, but
    should make defining S3 methods for print a little easier (#192).

  • The source output handler is now passed the entire complete input
    expression, not just the first component.

• evalute(include_timing) has been deprecated. I can't find any use of it on
  GitHub, and it adds substantial code complexity for little gain.

• is.value() has been removed since it tests for an object that evaluate
  never creates.

• New local_reproducible_output() helper that sets various options and env
  vars to help ensure consistency of output across environments.

• parse_all() adds a \n to the end of every line, even the last one if it
  didn't have one in the input. Additionally, it no longer has a default
  method, which will generate better errors if you pass in something unexpected.

• New trim_intermediate_plots() drops intermediate plots to reveal the
  complete/final plot (#206).

• watchout() is no longer exported; it's really an implementation detail that
  should never have been leaked to the public interface.