Increased SFP receive buffer size

Currently SFP does not parse partial binary SFP messages, so a system
may not work with large messages.
Fixed UART bridge not working in Release version

Provided by ks156 (Paul Rathgeb)
Extended GPIO functions to accept multi-pin arguments

GPIO functions (setPrimary/Secondary, mode, read, write) now accepts
byte arrays as arguments. This allows for one function to change
multiple pin states.