abc013

Results 3 issues of abc013

The current implementation only allows a single `float`: ```cs PlotHistogram(string label, ref float values, int values_count) PlotHistogram(string label, ref float values, int values_count, int values_offset) [...] PlotLines(string label, ref float...

**Description** ~The first commit of this PR adds two more hotkeys: 'escape' for deselecting nodes, and 'delete' for deleting the selected one.~ Previously, only some in- and ouputs were rendered...

![image](https://user-images.githubusercontent.com/21260178/31575560-f67b7d3c-b0e9-11e7-957b-cd1b33928ec8.png)

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