node: fixed issue with "taking" values from input tables

As opposed to simply leaving all values in the table, nodes can now "take"
values that they use to free up memory (e.g. "taking" input buffers if they're
used to produce an output buffer).

This is a fairly large change, expect regressions.

app/node/input.cpp

@@ -27,6 +27,7 @@
 
 #include "common/bezier.h"
 #include "common/lerp.h"
+#include "common/tohex.h"
 #include "common/xmlutils.h"
 #include "node.h"
 #include "output.h"
@@ -306,7 +307,7 @@ QString NodeInput::ValueToString(const DataType& data_type, const QVariant &valu
     }
 
     if (!value.isNull()) {
-      qWarning() << "Failed to convert type" << QStringLiteral("%1").arg(data_type, 0, 16) << "to string";
+      qWarning() << "Failed to convert type" << ToHex(data_type) << "to string";
     }
 
     /* fall through */