First attempt at implementing different codes

I'm not entirely happy with this, so any feedback or better solutions are welcome ;).
Hooray, ran "composer update"
Fix academicyear in restriction forms
Registration fix
Send to registration if one status is not set
possible to mail selective promotions
Merge branch 'master' of https://github.com/LitusProject/Litus
Add Stura link to site
More precision for cudi sell prices
Forgot to update config description
Send mail from form mail adress
Merge branch 'master' of https://github.com/LitusProject/Litus
Fix discount template
Fix academic year in some entities
very small fix
Merge branch 'master' of https://github.com/LitusProject/Litus
Small layout fix
Registration fix
More barcodes allowed
shift fix