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Fixes import error in create_api for Python 3.10+ (see #87)

Fix import error when using create_api outside a REPL (see #85).

Added

• An AbstractDiscreteInterval class to ease the creation of specialized discrete intervals (experimental).
• A create_api function to generate an API similar to the one of portion but configured to use a given subclass of Interval (experimental, see Specialize & customize intervals).

Changed

• Speed up repr and to_string for Interval instances (see #76, adm271828).
• Some internal changes to ease subclassing:
  • from_string and from_data accepts a klass parameter to specify which class should be used to create Interval instances (default is Interval).
  • Add a klass parameter for open, closed, openclosed, closedopen, singleton and empty (default is Interval).
  • Add a _klass class attribute in IntervalDict to specify how to create Interval instances (default is Interval).
  • IntervalDict uses self.__class__ to preserve subclasses when creating new instances.

Changed

• Speed up lookups in IntervalDict for non-interval keys.
• Speed up iterate by no longer creating singleton instances under the hood.
• Drop official support for Python 3.6.

Fixed

• Infinite recursion when a subclass of an Interval is compared using > with an Interval instance (see #75).

Added

• Support Python 3.10.
• IntervalDict.as_dict has an optional atomic=False parameter that, if set to True, returns intervals that are atomic.
• Experimental support for structural pattern matching (on left, lower, upper and right).

Fixed

• (breaking) Set list(P.empty()) == [], i.e., the empty interval is a disjunction of no interval (see #72).
• (breaking) For consistency, the empty interval is never <, >, <=, nor >= when compared to another interval.
• Comparing an interval and a value is deprecated since it is ill-defined when the value is on the left of <= or >=. Convert values to singletons first.

Added

• Support PEP 517.

Changed

• Some internal changes to ease subclassing Interval(see #58):
  • Use self.__class__ instead of Interval to create new instances;
  • Deprecate and move mergeable function to Interval._mergeable class method;
  • Interval.from_atomic is now a class method instead of a static method.
• Speed up lookups in IntervalDict (#65, Jeff Trull).
• Speed up removals in IntervalDict.
• Speed up intersection for non-overlapping intervals (#66, Jeff Trull).
• Speed up .overlaps and .contains for non-overlapping intervals/items.

Fixed

• from_stringraises a ValueError if given string cannot be parsed to an interval (#57).

Changed

• Drop official support for Python 3.5.
• Use black as official code formatting.

Fixes:

• Getting items from an Interval using a slice does no longer return a list but an Interval instance.
• Intervals are properly pretty-printed by pandas (#54).

Much faster get, copy and | operations for IntervalDict.

Soften dependency constraint towards sortedcontainers (#47).