Use more specific folder names and question about avatar cache

[Tiagoquix]

Hi there.

Currently, the app uess a very short name - "bd" - for its config. + cache files.

I would like to suggest a more specific name, such as "leigh_tf2_bot_detector" or "leigh_tf2bd", as "bd" may be used by another app somewhere else.

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Also, about avatar cache: are they cleared periodically? Not sure if it's a good idea to store them permanently (not saying this is how bd does, but I imagine this is how). I remember PazerOP's TF2BD doing this and easily occupying more and more megabytes of space.

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Thank you for your attention.