Make fixes, improvements, and chibicc python bindings

- python now mixes audio 10x faster
- python octal notation is restored
- chibicc now builds code 3x faster
- chibicc now has help documentation
- chibicc can now generate basic python bindings
- linenoise now supports some paredit-like features

See #141

third_party/chibicc/strarray.c

@@ -1,14 +1,17 @@
 #include "third_party/chibicc/chibicc.h"
 
 void strarray_push(StringArray *arr, char *s) {
+  size_t i;
   if (!arr->data) {
     arr->data = calloc(8, sizeof(char *));
     arr->capacity = 8;
   }
-  if (arr->capacity == arr->len) {
-    arr->data = realloc(arr->data, sizeof(char *) * arr->capacity * 2);
-    arr->capacity *= 2;
-    for (int i = arr->len; i < arr->capacity; i++) arr->data[i] = NULL;
+  if (arr->len + 1 == arr->capacity) {
+    arr->capacity += arr->capacity >> 1;
+    arr->data = realloc(arr->data, arr->capacity * sizeof(*arr->data));
+    for (i = arr->len; i < arr->capacity; i++) {
+      arr->data[i] = 0;
+    }
   }
   arr->data[arr->len++] = s;
 }