Node which loads arbitrary scripts or class files

[gab1one]

1.1. Idea: File selection. Script is copied into string storage or whatever. Then Dialog is created.
1.2 Mutate button to go back to file selection if desired.

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This can be based on the existing scripting node, replacing the code editor with a file chooser dialog.

[dietzc]

We should think about enhancing the nodes which will be implemented in knime-ip/knip-scijava#56, such that if knip-scripting is installed, these nodes can also consume scripts!