Functionality needed for the tournament

See merge request starcraft-ai-course/pycommandcenter!9

See merge request starcraft-ai-course/pycommandcenter!8 and closes issue #19

Adds functionality for reading and replaying replay-files, as well as
relevant documentation. See merge request !6 for more details. Closes
issue #16.

Added Library and Coordinator to the Navigation. Also moved text from ExtendAPI.md to docs/contributiong.rst

Fix unit type

See merge request edvbe696/pycommandcenter!7

Added perspectives and fixed get_player

See merge request edvbe696/pycommandcenter!6

Uppdaterat API

See merge request starcraft-ai-course/pycommandcenter!7

Add func to replays

See merge request edvbe696/pycommandcenter!5

Fixed some spelling

See merge request edvbe696/pycommandcenter!4

This reverts merge request !2

Docs for IDAReplayObserver and ReplayUnit

See merge request edvbe696/pycommandcenter!2

Add func to replays

See merge request edvbe696/pycommandcenter!1