Add batching api. To allow for setting multiple supersource boxes in the same packet

[joelkohler]

• I'm submitting a ...
  [ ] bug report
  [x ] feature request
  [ ] question about the decisions made in the repository
  [ ] question about how to use this project

• Summary
  I want to make an animated box transition for SuperSources. For the performance I need to set all box parameters from one or all SuperSources at one time.

[Julusian]

At the protocol level each box is configured as a separate command, but this library may not be allowing for those commands to be sent in the same packets, which is suboptimal.

So I think the solution here is for the currently private sendCommands method to be made public and to be verified to be performant. Then as a user you will have to manually create instantiate the command classes you wish to send and provide them to that method.

Perhaps a 'command batching' api would be nice to have in the future?

[joelkohler]

Yes that would be very great.

[Julusian]

In v3.4.0 it is now possible to batch commands using the sendCommands method, but it requires constructing the command classes manually.
In the future a 'command batching' api can be added to make this easier to achieve

[ifmx-dev]

It works, thx!