Preliminary gen 9 support

This release introduces basic gen 9 support. Random battles is the main format that has been tested - things are probably still a bit broken more generally. If you encounter something weird, please open an issue.

Features:

• Basic gen 9 support, including tera support
• Gen 9 effects
• Revamped data update scripts

Bug fixes:

• Typos in docs (#361)
• Fix a bug where spread zmoves message could freeze a battle
• Fix a bug where a disabled move error message could freeze a battle
• Fix recharge Move data
• Fix a bug in simple heurstic player choose move (#376)
• Fix a bug where some moves referencing other moves would get two pp uses instead of one (#355)
• Fix a bug where indented PS teams couldn't get parsed (#367)
• Fix max PP count. Now assumes maxed out PPs (#355)