Ftrack-query

- Now `in_('a', 'b', 'c')` will also work.

- Added the `in_` method to run subqueries.

- "Reserved" keywords are now allowed as entity attributes. Before, using syntax like `entity.sort.value` would result in an error since `sort` was a method.

- Under specific circumstances, the entity type can be called with a primary key.
Currently this support is just for `User`, with the syntax `user = session.User(username)`.
- Removed entity keyword guessing as it was a bit hacky and definitely not futureproofed.
An example of this was passing in a `FileComponent`, where it would evaluate to `file_component=FileComponent`

- Fix error when using a `Query` object inside the `sort` method.

- Inputs are all parsed in the same way now
- Added .asc() and .desc() for sorting
- Bug fixes/quality of life improvements