Consolidate and shrink down the re-used strings in logs (#4907)

* Consolidate and shrink down the re-used strings in GPS

* Condense all the things

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Co-authored-by: GUVWAF <thijs@havinga.eu>

src/serialization/MeshPacketSerializer.h

@@ -2,6 +2,7 @@
 #include <string>
 
 static const char hexChars[16] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};
+static const char *errStr = "Error decoding protobuf for %s message!\n";
 
 class MeshPacketSerializer
 {