More general custom RC protocol for remote transmitter

**Describe the problem you have/What new integration you would like**

Remote transmitter rc protocol should allow more than 2 values for sync and other field lists.

**Please describe your use case for this integration and alternatives you've tried:**

I am trying to integrate a BF-301 controlled shade system and it requires a protocol described here:
[BF-301 protocol](https://github.com/akirjavainen/markisol/blob/master/Markisol.ino)

I could use the raw transmit option, but this is tedious and the custom RC protocol would be sufficient and more efficient if I could better customize the sync, one, and zero fields.

**Additional context**

Begin with the linked Markisol.ino BF-301 protocol and list the required sync, one, and zero values, then compare them with the existing custom RC protocol behavior. Done means supporting more than two values for these fields so the BF-301 shade protocol can be represented without using raw transmit.

Written by the indexing model from the issue text.