Added scarpet team functions (#569)

* Added team functions

* Docs for team functions

* Added team functions to editor keywords

* Added static method getPlayerNameByValue to EntityValue (also works with non existing players

Co-authored-by: gnembon <41132274+gnembon@users.noreply.github.com>

docs/scarpet/api/Scoreboard.md

@@ -27,5 +27,80 @@ for the objective.
 
 ### `scoreboard_display(place, objective)`
 
-sets display location for a specified `objective`. If `objective` is `null`, then display is cleared. If objective is invalid,
+Sets display location for a specified `objective`. If `objective` is `null`, then display is cleared. If objective is invalid,
 returns `null`.
+
+# Team
+
+### `team_list()`, `team_list(team)`
+
+Returns all available teams as a list with no arguments.
+
+When a `team` is specified, it returns all the players inside that team. If the `team` is invalid, returns `null`.
+
+### `team_add(team)`, `team_add(team,player)`
+
+With one argument, creates a new `team` and returns its name if successful, or `null` if team already exists.
+
+
+`team_add('admin')` -> Create a team with the name 'admin'
+`team_add('admin','Steve')` -> Joing the player 'Steve' into the team 'admin'
+
+If a `player` is specified, the player will join the given `team`. Returns `true` if player joined the team, or `false` if nothing changed since the player was already in this team. If the team is invalid, returns `null`
+
+### `team_remove(team)`
+
+Removes a `team`. Returns `true` if the team was deleted, or `null` if the team is invalid.
+
+### `team_leave(player)`
+
+Removes the `player` from the team he is in. Returns `true` if the player left a team, otherwise `false`.
+
+`team_leave('Steve')` -> Removes Steve from the team he is currently in
+`for(team_list('admin'), team_leave('admin', _))` -> Remove all players from team 'admin'
+
+### `team_property(team,property,value?)`
+
+Reads the `property` of the `team` if no `value` is specified. If a `value` is added as a third argument, it sets the `property` to that `value`.
+
+* `collisionRule`
+  * Type: String
+  * Options: always, never, pushOtherTeams, pushOwnTeam
+    
+* `color`
+  * Type: String
+  * Options: See [team command](https://minecraft.gamepedia.com/Commands/team#Arguments) (same strings as `'teamcolor'` [command argument](https://github.com/gnembon/fabric-carpet/blob/master/docs/scarpet/Full.md#command-argument-types] options))
+
+* `displayName`
+  * Type: String or FormattedText, when querying returns FormattedText
+  
+* `prefix`
+  * Type: String or FormattedText, when querying returns FormattedText
+
+* `suffix`
+  * Type: String or FormattedText, when querying returns FormattedText
+
+* `friendlyFire`
+  * Type: boolean
+  
+* `seeFriendlyInvisibles`
+  * Type: boolean
+  
+* `nametagVisibility`
+  * Type: String
+  * Options: always, never, hideForOtherTeams, hideForOwnTeam
+
+* `deathMessageVisibility`
+  * Type: String
+  * Options: always, never, hideForOtherTeams, hideForOwnTeam
+
+Examples:
+
+```
+team_property('admin','color','dark_red')                 Make the team color for team 'admin' dark red
+team_property('admin','prefix',format('r Admin | '))      Set prefix of all players in 'admin'
+team_property('admin','display_name','Administrators')     Set display name for team 'admin'
+team_property('admin','seeFriendlyInvisibles',true)       Make all players in 'admin' see other admins even when invisible
+team_property('admin','deathMessageVisibility','hideForOtherTeams')       Make all players in 'admin' see other admins even when invisible
+```
+