Refactor for cleanliness

Move files into separate folders for ease of reading, include source
directory so we can use angle bracket includes, adjust build system to
make directories for objects

lisp/lisp.h

@@ -0,0 +1,57 @@
+/* Copyright (C) 2025 Aryadev Chavali
+
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License Version 2 for
+ * details.
+
+ * You may distribute and modify this code under the terms of the GNU General
+ * Public License Version 2, which you should have received a copy of along with
+ * this program.  If not, please go to <https://www.gnu.org/licenses/>.
+
+ * Created: 2025-04-06
+ * Description: Object model where we deal with contexts
+ */
+
+#ifndef LISP_H
+#define LISP_H
+
+#include <lib/sv.h>
+#include <lib/vec.h>
+#include <lisp/context.h>
+#include <lisp/tag.h>
+
+typedef struct Cons
+{
+  lisp_t *car, *cdr;
+} cons_t;
+
+typedef struct Cell
+{
+  u64 size;
+  u8 data[];
+} cell_t;
+
+lisp_t *make_int(i64 integer);
+lisp_t *make_sym(context_t *ctx, char *data, u64 size);
+lisp_t *make_cons(context_t *ctx, lisp_t *car, lisp_t *cdr);
+lisp_t *make_list(context_t *ctx, lisp_t **lisps, u64 size);
+lisp_t *make_vec(context_t *ctx, u32 size);
+lisp_t *make_str(context_t *ctx, char *data, u64 size);
+
+i64 as_int(lisp_t *obj);
+u32 as_char(lisp_t *obj);
+cell_t *as_sym(lisp_t *obj);
+void as_ssym(lisp_t *obj, sv_t *sv);
+bool as_bool(lisp_t *obj);
+f64 as_float(lisp_t *obj);
+cons_t *as_cons(lisp_t *obj);
+vec_t *as_vec(lisp_t *obj);
+vec_t *as_str(lisp_t *obj);
+
+sv_t serialise(context_t *ctx, lisp_t *lisp);
+
+#define CAR(PTR) (as_cons(PTR)->car)
+#define CDR(PTR) (as_cons(PTR)->cdr)
+
+#endif