cleaned up serial completing support for non blocking tx and refactoring formatting functions into a new module 'print'

print.h

@@ -0,0 +1,14 @@
+#ifndef print_h
+#define print_h
+
+void printNewline(void);
+void printString(const char *s);
+void printPgmString(const char *s);
+void printInteger(long n);
+void printHex(unsigned long n);
+void printOctal(unsigned long n);
+void printBinary(unsigned long n);
+void printIntegerInBase(unsigned long n, unsigned long base);
+void printFloat(double n);
+
+#endif