Add support for "chance for flasks you use to not consume charges" #4766
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This adds parsing for the modifier "x% chance for flasks you use to not consume charges" found on [Nature's Boon] and [Ascendant - Pathfinder], plus a few other miscellaneous locations.
This modifier functions as a multiplier to average flask charges used (as if it was "less flask charges used") and does not change minimum flask uptime estimates unless you somehow manage to get 100% chance — in which case your flask uptime is always 100%.
Link to a build that showcases this PR:
https://pobb.in/3R-tcSvESrkG
Before screenshot:
After screenshot: