Get rid of the raw pointers in the parser

CMakeLists.txt

@@ -19,10 +19,10 @@ add_executable(elnsh shell/main.cpp
 target_include_directories(elnsh PRIVATE include)
 
 add_executable(elna source/main.cpp
-	source/lexer.cpp include/elna/lexer.hpp
+	source/lexer.cpp include/elna/source/lexer.hpp
+	source/parser.cpp include/elna/source/parser.hpp
 	source/result.cpp include/elna/result.hpp
 	source/riscv.cpp include/elna/riscv.hpp
-	source/parser.cpp include/elna/parser.hpp
 	source/ir.cpp include/elna/ir.hpp
 	source/cl.cpp include/elna/cl.hpp
 )