Separate modules in smaller modules

[aruzeta]

Separate modules in smaller modules

[aruZeta]

Also would be nice to do the same with the tests ... but that will be on another issue.

[aruZeta]

Change of plans, removing Drawing.nim from the list since what actually makes it so big is the print procedures, which actually make no sense having them since they are only used by DrawedQRCode so it would make more sense to have those moved there, opening an issue for that rn. (Edit: check #15)

[aruZeta]

Removing also QRCode.nim since it's not even 100 lines long.

[aruZeta]

I've encountered an issue when importing 2 modules named main.nim, where I need to use the as operator to change it's name when imported I can't seem to make work with the way I structure imports, hence I'm changing a bit the structure of these separated modules.

[aruZeta]

Now it all seems better organized!