[Feature] Pity / chance to roll a character calculator

[fribbels]

Motivation

Sometimes I just want to know the chance of pulling a character given my current pity counter

Objective

Add a new tab with a calc tool for this: Input your current pity counter, # of warp tickets you have, and # of jade you have. Input the character you're trying to pull and the light cone, and, and the eidolon/superimposition goal, and output the chance of getting either, and both.

Add the tool to the Tools menu here