Secondary skill kit bonuses accumulate promiscuously

[RMTEW FULL NAME]

In theory, when someone uses a skill, they use their best primary skill kit, and apply one of each different secondary skill kits they have for cumulative bonuses.

In practice, there's only one type of secondary skill kit, which are viewing lenses.

The bug is that you can have 20 viewing lenses, and get 20 viewing lense bonuses ... one for each of your 20 eyes.

[RMTEW FULL NAME]

Fixes #239. An exploit that gives cumulative bonuses per each viewing lense in inventory, for any skill usage it helps with.

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