Security testing and improvements

Manual and automated testing following from first NLnet report and ahead of second review. Prevent running of arbitrary JavaScript.

Stringify inputs to colour block to match other text handling. 057e26e

Remove an stray dependency: 2ee805e

Remove legacy whitelisted functions that are no longer used: cd368bc

Address prototype pollution issue raised by CodeQL: 10ccb46

Remove ununsed SVG export

Add Blockly and generator validation for material colour text block

Add tests for validating blocks with fields for inputting text

Updated colour tests to expect defaulting to black rather than raisin…

Add test for keyword block to ensure that it cannot be generated

Workspace now clears after each test and is disposed of afterwards

Wrap endowed functions to prevent climbing

Refactor code loading

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