Add support for 31250 baud (MIDI)

v3.0.5

New version

C++ derivation fix

• Make overloaded write methods visible in derived NeoSWSerial. Calling any other write method was a compile error.

Add support for ATmega1281

PCINT0..7 are on PB0..7
PCINT8 on PE0 IS **NOT SUPPORTED**
PCINT9..15 are on PJ0..6
PCINT16..32 are on PK0..7

Convert to new Arduino library structure

Add missing paragraph= to library.properties -_-

Convert to new Arduino library structure

Convert to standard library structure

*  Ready to submit to Arduino Library Manager

Initial semver release

Add library.properties for #11

*  Move EXTERNAL_PCINT to header
*  Update version comments