[1.18] Fix EnumArgument to use enum names for suggestions (#8746)
Previously, the suggestions used the string representation of the enum
through Enum#toString, which can differ from the name of the enum as
required by Enum#valueOf, causing invalid suggestions (both in gui and
through the error message).
Using Enum#name fixes this discrepancy, so now the suggestions are
always valid inputs regardless of the return of Enum#toString.
Fixes #8618
Redirect checks for entity selector use to a permission (#8947)
This allows greater flexibility for configuring servers with
operator-like permissions to user groups through the permissions API and
their permissions handler of choice without needing to grant the
vanilla operator permission to any player.
The new permission is "forge:use_entity_selectors", which is granted by
default to players with permission level 2 (GAMEMASTERS) and above.
The hook falls back to checking the permission level if the source of
the command is not a ServerPlayer, such as for command blocks and
functions.
