parser -> lexer

That's the real purpose of this module; it's not really generating an
AST since ARL's syntax isn't tree like whatsoever.

The next stage will be something closer to an AST, in the sense we'll
be introducing:
- Syntactical analysis
- Type Checking

Makefile

@@ -3,8 +3,8 @@ CC=cc
 DIST=build
 OUT=$(DIST)/arl.out
 
-MODULES=. lib parser
-UNITS=main lib/vec lib/sv parser/ast parser/parser
+MODULES=. lib lexer
+UNITS=main lib/vec lib/sv lexer/token lexer/lexer
 OBJECTS:=$(patsubst %,$(DIST)/%.o, $(UNITS))
 
 LDFLAGS=