Bukkit

New minecraft version: 1.17.1 (bukkit).

Customisation of bossbar timer:

bossbar_display_options:

• possible colors: blue, green, pink, purple, red, white, yellow
• possible styles: segmented_solid, segmented_6, segmented_10, segmented_12, segmented_20

Adding permissions and groups of permissions:

• Group: fightsession.group.admin
• Group: fightsession.group.player
• permission: fightsession.help
• permission: fightsession.time
• permission: fightsession.targets

minor change to default translations.