refactor(clox): Move assignment checker to compiler object

fix(clox): Synchronising the compiler would result in an infinite loop

refactor(clox): Extract compiler strategies into their own file

feat(clox): Global variables

This has been a challenging chapter. I'll have to take some notes and
will probably do some cleanup of the compiler source to help with
understanding the code later on.

feat(clox): Debug trace options and toggles

feat(clox): Disassemble strings, improve debug print style

refactor(clox): Make Vm a non-static object

refactor(clox): Make scanner, parser, compiler non-static

feat(clox): Hash map and hash set for strings

refactor(clox): Use designated struct initialisers

feat(clox): String literals and concatenation

chore(clox): Add address sanitiser compilation option

fix(jlox): Operator == was working as !=

feat(clox): Boolean and nil types

feat(clox): Expression parser and Pratt compiler

chore(jlox): Simplify Makefile, remove unused AstPrinter

chore(clox): Create modules with their own Makefiles

feat(clox) Source code scanner

refactor(clox): Define LOXVm_print_stack only if LOX_DEBUG_TRACE

Otherwise, the compiler warns about the unused function when LOXDEBUG
isn't defined.

refactor(clox): Remove unneeded const qualifier from prototypes