Abstract Inmoov_Firmware arduino code to support the standard arduino implementation

[alansrobotlab]

Update Arduino sources to support the standard inmoov configuration (Arduino Mega + Arduino Uno)

• Be flexible enough to support other arduino driven configurations.
• Rename package InMoov_Arduino?
• Support enabling/disabling functions that rely on a/d input
  • wrap in ifdef
  • disable moveto on enable() if no initial position defined

If possible, make it eas(ier) for new people by maybe having the default configuration for the standard inmoov arduino setup?