Fully unit-tested, modular I2C implementation

Improved Error Messages
Homogenized unit-test output

ver: Roll version to `v1.3.4` (#46)

* remove note-c before re-add

* Squashed 'src/note-c/' content from commit ceceeb2
git-subtree-dir: src/note-c
git-subtree-split: ceceeb2c9a34540c5c3905c548378f00f6c58428

* Support `Notecard::newCommand` API

Added tests and syntax highlighting for `Notecard::newCommand` API

v1.3.3

• Update contributing.md
• Update Example3_InboundPolling.ino
• Add support for Commands
• Update note-c

v1.3.2: Remove warnings (#40)

Clear compiler warnings across various platforms/compilers.

patch: Improve 16-bit microcontroller support.

Ensures compatibility with Arduino Uno.

feat: Notecard::begin(Serial) baud default

Added default baud parameter to simplify API usage.

v1.2.10

chore: update note-c (#34)

* remove note-c before re-add

* Squashed 'src/note-c/' content from commit 9dc64f0

git-subtree-dir: src/note-c
git-subtree-split: 9dc64f06dfadc50847c92dd0b4bc7e8946ae6c1d

* chore: update note-c

v1.2.9

• Change note.add start:true -> sync:true
• Update all samples to use I2C by default

v1.2.8

• Add Sensor tutorial source as a new example
• Harmonize PUID naming
• Update note-c

v1.2.7

Fix ESP32 Button state on periodic communications example