Added stricter error checks by the compiler, and adapted all impacted code.

Primarily -
* Added "static" to static functions.
* Added proper signature with "void" to functions without arguments.
* Marked unused arguments with "(void)".
* Removed entirely unused static functions.
* Added "const" to preserve const-correctness.
* Added function prototypes for external functions.

examples/example_2/src/ProductionCode2.c

@@ -3,6 +3,8 @@
 
 char* ThisFunctionHasNotBeenTested(int Poor, char* LittleFunction)
 {
+  (void)Poor;
+  (void)LittleFunction;
   //Since There Are No Tests Yet, This Function Could Be Empty For All We Know.
   // Which isn't terribly useful... but at least we put in a TEST_IGNORE so we won't forget
   return (char*)0;