Don't use turn types into hex anymore.
Be safer in load_events() for weird cases.
Add T15 attribute value, trim whitespaces.
fix some unit stats
Add the tracker events at the new location.
Add basic context loading.

A unit type name -> unit type id map is needed to use the Born and
Init events fully.

A unit tag index -> unit map is needed to use the Positions event.
Full tracker event support. Unstable.
Add defaults, improve documentation, add fields.

Now supports all tracker events except UpgradeComplete events.
Fix replay.active_units management.
Be safe and print warnings for tracker events.
Add support for is_type(str_id).
Check for type differences with is_type for None safety.
Comment out a slew of warnings that don't usually mean much.
Completely redo the game events parsing.
fix the CONFLICT complaint
Load context across all event types in frame order.
Improved the tracker events processing.

Tracker Events now provide:

	unit.owner
	player.units
	unit.started_at
	unit.finished_at
	unit.died_at
Store a unit -> location map instead.
fix hive darkshrine and refinery resource values
Make links between players and killed units.