Made darr in DArray_at const. Added ScufContResult_to_str().

src/scufcont.c

@@ -1,3 +1,13 @@
 #include "scufcont/scufcont.h"
 
 const char* SCUFCONT_VERSION = _SCUFCONT_VERSION;
+
+const char* ScufContResult_to_str(const ScufContResult res) {
+#define ScufContResult_to_str_case(val) \
+    case val: \
+        return #val;
+
+    switch (res) {
+    SCUFCONT_RESULT_X(ScufContResult_to_str_case)
+    }
+}