upgrade random specification

[acxz]

some thoughts on revamping random to get more functionality out of it to make more people happy

# random syntax: random, random,nat#bulbasaur,genIII=>genIV,kanto#147=>151,turtwig=>arceus
# allow to specify, random based on each pokedex i.e. national, kanto, etc.
# if no dex name, then assume national
# valid pokemon identifiers can be used, including names and national ids i.e. nat#bulbasaur-blastoise
# should also add "regional dex#num" as a valid identifier as well tbh
# think of a better delimiter than '#' for separating dex name and specifier pokemon
# based on each gen i.e. I, II, etc.
# tbh the parser has gotten big enough that it should be its own library
# having random based on types (i.e. electric/dark would be nice as well)
# also based on shape (https://bulbapedia.bulbagarden.net/wiki/List_of_Pok%C3%A9mon_by_shape)
# maybe figure out a way how to programmatically allow filtering based on any particular tag like what if we wanted [colors](https://bulbapedia.bulbagarden.net/wiki/List_of_Pok%C3%A9mon_by_color#List_of_colors) and egg groups?
# i.e. pokeshell random,gen=I,type=electric,shape=quadruped random,gen=II,type=steel,shape=serpentine
# or something like pokeshell random,gen=-I,type=-electric+water
# having the `-` syntax allows specifying which ones not to have, since pokemon can have multiple types, type would need to support `+` and `-`. Note that `+` would also interfere with the gender delimiter... Think about it.

# update gender handling to have proper inclusion of genderless