vec: is_inlined -> not_inlined

If you allocate a vector on the stack and default initialise
it (i.e. {0}), then by default "is_inlined" = 0.  This is bad, as
technically speaking we should expect the vector to attempt to use
it's small inline buffer for vector operations before going onto the
heap - this will mess up our functions.  So here I adjust the name to
make default stack based allocation a bit easier.

alisp.h

@@ -66,7 +66,7 @@ typedef struct Vector
 {
   u64 size, capacity;
   // Small buffer optimisation
-  u8 is_inlined;
+  u8 not_inlined;
   union
   {
     void *ptr;

runtime/sys.c

@@ -21,12 +21,13 @@
 void sys_init(sys_t *sys)
 {
   memset(sys, 0, sizeof(*sys));
+  vec_init(&sys->conses, 0);
 }
 
 void sys_register(sys_t *sys, lisp_t *ptr)
 {
   // Simply append it to the list of currently active conses
-  vec_append(&sys->conses, ptr, sizeof(ptr));
+  vec_append(&sys->conses, &ptr, sizeof(&ptr));
 }
 
 void sys_cleanup(sys_t *sys)

runtime/vec.c

@@ -25,13 +25,13 @@ void vec_init(vec_t *vec, u64 size)
     return;
   else if (size <= VEC_INLINE_CAPACITY)
   {
-    vec->is_inlined = 1;
+    vec->not_inlined = 0;
     vec->capacity    = VEC_INLINE_CAPACITY;
     vec->ptr         = NULL;
   }
   else
   {
-    vec->is_inlined = 0;
+    vec->not_inlined = 1;
     vec->capacity    = size;
     vec->ptr         = calloc(1, vec->capacity);
   }
@@ -41,14 +41,14 @@ void vec_free(vec_t *vec)
 {
   if (!vec)
     return;
-  if (!vec->is_inlined && vec->ptr)
+  if (vec->not_inlined && vec->ptr)
     free(vec->ptr);
   memset(vec, 0, sizeof(*vec));
 }
 
 void *vec_data(vec_t *vec)
 {
-  return vec->is_inlined ? vec->inlined : vec->ptr;
+  return vec->not_inlined ? vec->ptr : vec->inlined;
 }
 
 void vec_ensure_free(vec_t *vec, u64 size)
@@ -58,7 +58,7 @@ void vec_ensure_free(vec_t *vec, u64 size)
   if (vec->capacity - vec->size < size)
   {
     vec->capacity = MAX(vec->capacity * VEC_MULT, vec->size + size);
-    if (vec->is_inlined)
+    if (!vec->not_inlined)
     {
       // If we're inlined, we need to allocate on the heap now.  So let's copy
       // vec->inlined over to vec->ptr, then turn off inlining.
@@ -69,7 +69,7 @@ void vec_ensure_free(vec_t *vec, u64 size)
       memcpy(buffer, vec->inlined, vec->size);
       vec->ptr = calloc(1, vec->capacity);
       memcpy(vec->ptr, buffer, vec->size);
-      vec->is_inlined = 0;
+      vec->not_inlined = 1;
     }
     else
       vec->ptr = realloc(vec->ptr, vec->capacity);