Implement Dialog packet and add MP.ConfirmationDialog

[WiserTixx]

This PR implements a new lua function and packet used for sends dialogs to the client.

Example:

BeamNG.drive.x64_kX4w6Kaly9.mp4

Example serverside code:

--MP.ConfirmationDialog(player_id: number, title: string, body: string, buttons: object, interaction_id: string, warning: boolean = false, reportToServer: boolean = true, reportToExtensions: boolean = true)

function onChatMessage(player_id, player_name, message)
    MP.ConfirmationDialog(player_id, "Warning", "Watch your tone buddy!!", 
        {
            {
                label = "OK",
                key = "dialogOK",
                isCancel = true
            }
        }, "interactionID", true)
end

MP.RegisterEvent("onChatMessage", "onChatMessage")


function dialogOK(player_id, interaction_id)
    MP.SendChatMessage(-1, MP.GetPlayerName(player_id) .. " clicked OK")
end

MP.RegisterEvent("dialogOK", "dialogOK")

Details:

Each dialog can have multiple buttons, each button having it's own callback event (key).
Each dialog can also have one button with isCancel being true, settings this property to true causes the button's event to be called when the users pressed esc to exit out of the dialog. If a dialog is created without any button being the cancel button then the user will only be able to exit the dialog by restarting the session or pressing one of the buttons.

interaction_id will be sent as the event data with a button press event, to track from which dialog the button press came. As when multiple dialogs are opened they will stack and it will become difficult to track what button on which dialog was pressed without having multiple event handlers.

Waiting on BeamMP/BeamMP#715 to be merged.

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[SaltySnail]

Cool feature, lgtm. Be sure to add the example code to the docs so people know how the format the packet

[SaltySnail]

lgtm