CppCheck cleanup (#975)

* Add support for inline cppcheck suppressions
* Clean out all known cppcheck issues
* Terminate toll-gate on found cppcheck issues

drivers/Linux/Stream.cpp

@@ -30,9 +30,9 @@
 // private method to read stream with timeout
 int Stream::timedRead()
 {
-	int c;
 	_startMillis = millis();
 	do {
+		int c;
 		c = read();
 		if(c >= 0) {
 			return c;
@@ -45,9 +45,9 @@ int Stream::timedRead()
 // private method to peek stream with timeout
 int Stream::timedPeek()
 {
-	int c;
 	_startMillis = millis();
 	do {
+		int c;
 		c = peek();
 		if(c >= 0) {
 			return c;
@@ -61,8 +61,8 @@ int Stream::timedPeek()
 // discards non-numeric characters
 int Stream::peekNextDigit()
 {
-	int c;
 	while(1) {
+		int c;
 		c = timedPeek();
 		if(c < 0) {
 			return c;  // timeout