Implement Some Energy-related Stuff

[GanyusLeftHorn]

Description

This PR implements and fixes some energy-related things. In particular:

• Energy particles created by elemental skills now are of the correct elemental type (were elementless before).
• Picking up energy particles or orbs now gives the correct amount of energy depending on character element, and also now honors the character's energy recharge stat.
• Using an elemental burst now depletes energy. Since by far not all energy-related features are implemented yet, this is configurable via a new server.game.game.gameOptions.energyUsage settings in config.json, which default to false, preserving the current behavior of bursts always being full as the default.
• Fixes the traveller not being able to gain energy (issue Main characters elemental bursts doesn't work. #994).

Known issues and energy stuff that is still missing (not necessarily an exhaustive list):

• Some character skills don't generate the correct amount of particles. As far as I can tell, this is caused by ClientAbilityInitFinishNotify not having the correct number of ABILITY_ACTION_GENERATE_ELEM_BALL entries. I don't know yet what is causing this to be the case for some, but not all, skills.
• Some energy generation by weapon passives, like that of the Favonius weapons, does not work correctly.
• We don't generate energy for NAs/CAs yet.
• Enemies don't drop energy particles/orbs yet.

Issues fixed by this PR

#994

Type of changes

• Bug fix
• New feature
• Enhancement
• Documentation

Checklist:

• My code follows the style guidelines of this project
• My pull request is unique and no other pull requests have been opened for these changes
• I have read the Contributing note and Code of conduct
• I am responsible for any copyright issues with my code if it occurs in the future.

[ghost]

It is reccomended to use TeamManager::getCurrentAvatarEntity()

[GanyusLeftHorn]

But that only gives me the currently active avatar, doesn't it? The character generating the particle doesn't have to be active (think for example Zhongli's pillar generating a particle while he is off field).