Dynamic Boot Spacing

[krubenok]

Description of Problem / Inefficiency:

#180 introduced ?boot with support for alternate emojis or any other sequence of characters. It would be good if the offset spacing was dynamically detected so that pyramids with non-standard characters (I.e. not an emoji) had slightly straighter emojis.

Implementation Suggestion:

Simple solution would be just to insert n spaces for n characters in the input string. There might need to be a multiple for emojis which are a few spaces wide. Maybe there's a better algorithm for finding the space-width of a string.

Additional Context / Screenshots:

Like this:

Not this: