pushed more to the main base class api wise so that a implementation only needs to implement a single read and single write method at the minimum; normalized the API - overloaded methods and data sized methods that follow stndint data typeing (UInt8, UInt16, UInt32); cleared out the methods no needed in the ArdI2C and ArdSPI drivers - kept the SPI drivers that use transfer16() method -- whre applicable

Author: gigapod

src/sfTk/sfTkError.h

@@ -1,4 +1,4 @@
- /**
+/**
  * @file sfTkError.h
  * @brief Header file for the SparkFun Toolkit - Base Error Code defines.
  *
@@ -11,7 +11,6 @@
  * SPDX-License-Identifier: MIT
  */
 
-
 #pragma once
 
 #include <stdint.h>
@@ -46,6 +45,11 @@ const sfTkError_t ksfTkErrFail = -1; // general fail
  */
 const sfTkError_t ksfTkErrOk = 0; // success
 
+/**
+ * @brief Invalid parameter error
+ */
+const sfTkError_t ksfTkErrInvalidParam = -2; // invalid parameter error
+
 /**
  * @brief A base value for bus errors. All bus errors are greater than this value, in the 1000 range
  */