refactor

remove the free function entirely. all allocators are now expected to
implement reset instead. I reallized I never ever want to free an
individual allocation ever again. The forever_allocator is a special
case wherEreset is a no-op. The arena allocator was deleted. It will be
replaced soon.

std_allocator.c

@@ -1,34 +1,27 @@
 #include "cig.h"
 
-static void *stdlib_alloc(void *this, size_t bytes, const char *file, int line) {
+static void *forever_alloc(void *this, size_t bytes) {
     (void)this;
-    (void)file;
-    (void)line;
     return malloc(bytes);
 }
-static void *stdlib_resize(void *this, void *old_ptr, size_t bytes, const char *file, int line) {
+static void *forever_resize(void *this, void *old_ptr, size_t bytes) {
     (void)this;
-    (void)file;
-    (void)line;
     return realloc(old_ptr, bytes);
 }
-static void stdlib_free(void *this, void *ptr, const char *file, int line) {
+static void forever_no_op(void *this) {
     (void)this;
-    (void)file;
-    (void)line;
-    free(ptr);
 }
 
-static const allocator_vtbl_t stdlib_vtbl = {
-    .alloc = stdlib_alloc,
-    .resize = stdlib_resize,
-    .free = stdlib_free,
+static const allocator_vtbl_t forever_vtbl = {
+    .alloc = forever_alloc,
+    .resize = forever_resize,
+    .reset = forever_no_op,
 };
 
-allocator_t allocator_stdlib() {
+allocator_t forever_allocator() {
     return (allocator_t) {
         .this=NULL,
-        .vtbl=&stdlib_vtbl,
+        .vtbl=&forever_vtbl,
     };
 }