Enhancement: aloevera asm support to select multiple (formatted) imagesets for output to a single .bin file

[CJLove]

This is kind of a special case that mainly applies if using aloevera asm -f bin and not for other output formats. The use case is if you've got multiple formatted imagesets (e.g. sprites images of different size) which you'd like to assemble into a single binary file.

An initial idea would be to allow multiple -select xxx arguments in the aloevera asm command.

[StewBC]

Totally agree with this request. Additionally, I would say order matters so if something like -f singlebin is used, and not select, the output oreder needs to be consistant, i.e. the order of the list command, or alphabetical or something. If select is used, pack the images in select command line order.