Implemented a basic compiler that integrates lexer and parser + assembler directives explained

[Fiwo735]

As discussed over MS Teams.

[Jpnock]

Great work here! This was certainly needed as previously you could spend anywhere from five to ten hours trying to get this framework setup yourself, just to get to a point where you could add a single feature to your compiler. Collectively this will easily save hundreds of hours across the cohort :D

I've made some suggestions which can be summed up as:

• More Makefile improvements (track dependencies more generically, use GNU bison instead of yacc & also depend on the Makefile itself)
• Pass the Context by reference instead of by copy

Additionally, I'd maybe take a look at the int f() { return; } example as this leads to undefined behaviour; this is as the value of f() is used by example_driver.c when running ./test.sh. So this needs to be reworked I think (maybe back to the original return 5, even if it does mean having to add a Number/IntegerConstant class). I've put some more details on the line itself.

[Fiwo735]

Thanks for the review James, I really appreciate it! Saving hundreds of hours across the cohort was indeed my biggest motivation!

Re Makefile - brilliant changes, setting makefiles is not my strong point, but your version makes much more sense (and hopefully is even less error-prone for the students).
Re Context - passing by reference was indeed my plan, but I simply mistyped it once and then copy-pasted wrongly in each place... thanks for spotting that!

I've left some minor comments in some of your suggestions above and committed the rest of them.