Awacs

* Big thanks to michael-k for the greatly improved code generation!
* Replace the generator tool
* Add all missing actions, fix service names, and remove duplicates
* Add a GitHub Action that regularly updates the IAM actions
* Drop support for Python 3.5
* [travis] Remove `./scrape` if Python <3.6 to avoid invalid syntax errors

* Add 291 new actions (142)
* Add codeartifact actions (145)
* Add 380 new actions (148)
* change isinstance AWSHelperFn to inspect class names (141)

* Add 375 new actions (140)

* Make Python 3.8 support official (136)
* Add 98 new actions from updates in August/September (134)
* Add 121 new actions from updates in October and 1/3 November (138)

* Add 95 new actions from updates in first half of August (133)

* Add 60 new actions from July updates (132)