Split alisp.h into several header files, in /include folder.

include/alisp/vec.h

@@ -0,0 +1,55 @@
+/* vec.h: Dynamic Arrays with SBO
+ * Created: 2026-02-04
+ * Author: Aryadev Chavali
+ * License: See end of file
+ * Commentary:
+ */
+
+#ifndef VEC_H
+#define VEC_H
+
+#include <stddef.h>
+
+#include <alisp/base.h>
+
+#define VEC_INLINE_CAPACITY 32
+#define VEC_MULT            2
+
+typedef struct Vector
+{
+  u64 size, capacity;
+  // Small buffer optimisation
+  u8 not_inlined;
+  union
+  {
+    void *ptr;
+    alignas(max_align_t) u8 inlined[VEC_INLINE_CAPACITY];
+  };
+} vec_t;
+
+static_assert(sizeof(vec_t) == 64, "vec_t has to be 64 bytes as part of SBO");
+
+#define VEC_GET(V, I, T) (((T *)vec_data(V))[I])
+#define VEC_SIZE(V, T)   ((V)->size / (sizeof(T)))
+
+void vec_init(vec_t *, u64);
+void vec_free(vec_t *);
+u8 *vec_data(vec_t *);
+
+void vec_append(vec_t *, const void *const, u64);
+void vec_ensure_free(vec_t *, u64);
+void vec_clone(vec_t *, vec_t *);
+
+#endif
+
+/* Copyright (C) 2026 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 Unlicense for details.
+
+ * You may distribute and modify this code under the terms of the Unlicense,
+ * which you should have received a copy of along with this program.  If not,
+ * please go to <https://unlicense.org/>.
+
+ */