* Doc: logic mixin, drop underscore, clarify
conventionally, we added a leading underscore to logic mixins' function
names. This is noisy in the warning section of IDEs. Leading underscores
should only be used for private/protected functions.
In addition, the use of self.world and/or requirement to (no) pass in stuff
was not made clear earlier.
* SoE: fix _ warnings for logic mixin
* fix missing fields in custom prog balancing option
* fix typos and pep8
* update and implement pyevermizer 0.41.3
* allow randomizing energy core
* add energy core fragments (turn in at Prof. Ruffleberg)
* rename some items to avoid confusion
* differentiate between progression and useful
* remove obsolete 'Bazooka' group
* don't add items to the pool that get removed
`AutoWorld.World`s can set required_server_version and required_client_version properties. Drop `get_required_client_version()`.
`MultiServer` will set an absolute minimum client version based on its capability (protocol level).
`IgnoreVersion` tag is replaced by using `Tracker` or `TextOnly` with empty or null `game`.
Ignoring game will also ignore game's required_client_version (and fall back to server capability).