split qcbor.h into four separate headers (#34)

This is to make it much easier to read the header files.

Backwards compatibility with qcbor.h is retained, but use of qcbor/qcbor_encode.h and qcbor/qcbor_decode.h is preferred now.

Signed-off-by: Laurence Lundblade <lgl@securitytheory.com>
diff --git a/test/run_tests.c b/test/run_tests.c
index 8e52dae..5c0abe3 100644
--- a/test/run_tests.c
+++ b/test/run_tests.c
@@ -275,7 +275,10 @@
 }
 
 
-#include "qcbor.h" // For size printing
+// For size printing
+#include "qcbor/qcbor_encode.h"
+#include "qcbor/qcbor_decode.h"
+
 
 /*
  Public function. See run_test.h.