Add scripting functions to facilitate having the script carry players

[NovaSquirrel]

Add a new scripting callback named request_result, containing:

• accepted - true/false, for if the user accepted the request or not
• type - request type
• name, username, id - the user that accepted or denied the request

Additionally, create some functions to make the entity try to carry another, similar to the functions that take controls.

[NovaSquirrel]

Implemented request_result, but called it result instead of accepted