web: Spoof prototypes to prevent false positive bot detections

[lihe07]

Some bot detection libraries will detect the prototypes for navigator.plugins.

Current extension will cause false positives in such detections. (for example: by BotD)

This PR includes code that spoofs prototypes of related objects.

[Dinnerbone]

Thank you for this! Unfortunately it seems to break things, al of the tests are now failing with:

Uncaught TypeError: navigator.plugins.install is not a function

[lihe07]

Thank you for this! Unfortunately it seems to break things, al of the tests are now failing with:

Uncaught TypeError: navigator.plugins.install is not a function

Thank you!

Now things should work, and navigator.plugins instanceof PluginArray should be true.

[evilpie]

I want to look into this next week.