Added an include of mfr menu teomplate to index template. Doesn't work yet though.
Got manufacturer menu working by embedding menu controller in twig template. Also changed links in twig template for menu so they are relative rather than hard coded. As they didn't work before when the menu was used elsewhere
Put menu in start of every template and did some general tidying up, eg made links work in mfr information page. Also generated entity for model. but not persisted changes to database yet. Also need to work out how best to relate manufacturer and model entities. Symfony documentation suggests putting an array foreign key in the manufacturer entity in addition to the foreign key in model. That could be a very big array with a big table like the deal table. ie if it has 1,000,000+ records. I think it's stupid, but I could be wrong...
changed entity/Model.php to remove mfrName field, as going to use mfrId as foreign key instead. So this isn't needed. I hope...
Made a couple of minor changes to Manufacturer information template and controller - included mfrID in template.

Added Model entity and created database with foreign key to Manufacturer.