Convert 'default', 'choices', 'sample' to type; change booleans to 'true' and 'false'

[felixfontein]

Implements ansible-community/community-topics#116

[felixfontein]

The part on converting default, sample, and choices is necessary since there are quite a few modules and plugins which use strings like "yes" to provide default values (or choices, or samples), instead of proper boolean values. Without this change, there were quite a few cases where for a boolean parameter / return value the choices are true and false, but the default is yes, False, or something else. (Strings with False, True, false, or true in them are already showing up wrong at the moment.)

[felixfontein]

You can find generated docs at https://ansible.fontein.de/collections/

[Andersson007]

@felixfontein thanks for implementing the decision!

[felixfontein]

@Andersson007 thanks for reviewing this!