Allow 10-digit tricodes and custom on/off-suffixes
Some systems such as "Elro AB440S" make use of ten digit tricodes and use different suffixes for on/off.
These fields are added to the `rc-switch` preferences (i.e., separate for every single switch), which allows parallel usage of different systems.

Tested with "Elro AB440S". Previous setups should still work.
Merge pull request #71 from tjanson/elro-tricodes

Allow 10-digit tricodes and custom on/off-suffixes