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/render/backend/opengl/openglworker.cpp

@@ -45,7 +45,7 @@ void OpenGLWorker::FrameToValue(DecoderPtr decoder, StreamPtr stream, const Time
   }
 }
 
-void OpenGLWorker::RunNodeAccelerated(const Node *node, const TimeRange &range, const NodeValueDatabase &input_params, NodeValueTable *output_params)
+void OpenGLWorker::RunNodeAccelerated(const Node *node, const TimeRange &range, NodeValueDatabase &input_params, NodeValueTable &output_params)
 {
   emit RequestRunNodeAccelerated(node, range, input_params, output_params);
 }