Pedal

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* Changed spacing in the terminal environment
* Temporarily disabled unit_test as a context manager while the skulpt version is fixed
* Fixed TIFA bug with update assignment of attributes
* Initial type and runtime support for Drafter
* First version of Cloud tool
* Some of the code for the Pools feature
* Ongoing work related to fixing up the Score API

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* The explain, gently, guidance, and compliment functions can now take `message_template` as a keyword parameter INSTEAD of `message`
* Fixed a bug in assert_regex and assert_not_regex
* Added in assert_output_regex and assert_not_output_regex
* Custom resolvers now better supported from command line
* Added simple/single resolver to gradescope

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* Allow unit_test to be used as a context manager
* Various documentation improvements
* Improved table output on terminal
* Provide Sandbox command get_function to wrap a function with call
* Testing libraries are now exposed in the top-level import

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* Fix error where a blank file would break the terminal environment.

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* Correctly importing close_output and correct_output from assertions.positive

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* Considered feedback is now collected in the Final Feedback object's `considered` field
* Changed terminal to no longer allow output to a file
* (Hopefully) fix Cait's find_all function for visit_Num in 3.7