Make Sonoff Bridge optional by define

[Jason2866]

Description:

Make Sonoff Bridge optional by define

Checklist:

• The pull request is done against the latest dev branch
• Only relevant files were touched
• Only one feature/fix was added per PR.
• The code change is tested and works on core 2.3.0, 2.4.2, 2.5.2, and pre-2.6
• The code change pass travis tests. Your PR cannot be merged unless tests pass
• I accept the CLA.

[arendst]

Almost complete.

You also have to undefine the code in webserver.

Pls do a search on SONOFF_BRIDGE and resolve.

[Jason2866]

Hope i did it right, I am not a coder…