Allow more configuration of the besticon package #75
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This adds a new Besticon struct from which all the other methods
are called. This allows removing all global variables and constants
and replacing them by functional options. This makes it easier to
configure all options with e.g. different named environment variables.
This is a breaking change since it changes how all methods need to be
called.
Something which is not in this PR but may be useful is to remove the
IconFinder
and change it to be aFetchIcons
method on theBesticon
struct which takes functional options as well.
See: https://dave.cheney.net/2014/10/17/functional-options-for-friendly-apis