Reorganise module

Features

• Split base.py into abstract.py and utils.py
• Moved FTrackQuery from query.py to __init__.py

Improvements

• and_() and or_() will skip any None inputs

Fixes

• Fix error when closing session in debug mode
• Fix potential error when using asc() and desc()

Event class and Python 3

Features

• Event class
• Update to Python 3

Improvements

• Add __call__ method to entities as an alternative to using __eq__
• Automatically remap query to use IDs if passing list of entities into .in_()

Fixes

• Inverting a query will now correctly recalculate the order of operations
• Speech marks are now escaped in strings

Better support for reversing queries

• not_ function added.
• Reversing a reversed query will now un-reverse it.

Improve subquery support

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

Add subquery support

• Added the in_ method to run subqueries.

Separate entity class

• "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.

Remove entity guessing and add quick access with primary keys

• 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 bug with attribute sort check

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

Input parsing and better sorting

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

Validation and fixes

• Helper for creating CalendarEvent entities
• Expand Comparison.has and Comparison.any functionality to match Query.where
• Fix FTrackQuery.get to be compatible with ftrack_api.Session.get
• Improve logging
• Check entity type exists before creating a Query object
• Add __reversed__ method to swap sort order