Cache last 100 used requests

[ianfhunter]

Is your feature request related to a problem? Please describe.

Looking at Avrae's dice roller, they cache frequent roll strings so they don't have to be repaired, saving a bunch of time. We should see if we can do something similar.

Describe the solution you'd like

Configurable size cache with compile time define (size 0 to disable)
Performance measurement of overhead.

Describe alternatives you've considered

Additional context

[ianfhunter]

Requires overhaul