Better caching options

[masklinn]

• [x] random replacement
• [x] fifo
• [x] LFU
• [x] general purpose Quick Demotion (QD) decorator (?) FIFO w/ flag + ghost cache
• [x] QD-LP-FIFO
• [x] W-TinyLFU
• [x] sieve

Possible additional candidates:

• ARC have not looked at it yet but people seem to find it very complex
• LFU with dynamic aging
• segmented LRU
• Clock (FIFO with reinsertion? not entirely clear) with Adaptive Replacement

Closes #143

[cmcaine]

Thanks for the citation/credit :) I'm glad you found my code useful!