Rename YABRIDGE_TEMP_PATH to YABRIDGE_TEMP_DIR

I liked the `_PATH` version better initially, but the `_DIR` verison has
a better ring to it and it's more consistent with `$XDG_RUNTIME_DIR`. #139

README.md

@@ -669,7 +669,7 @@ the yabridge [Discord](https://discord.gg/pyNeweqadf).
   namespace while the host is not sandboxed, then you'll have to use the
   `YABRIDGE_NO_WATCHDOG` environment variable to disable the watchdog timer. If
   you know what this means then you probably know what you're doing. In that
-  case, you may also want to use `YABRIDGE_TEMP_PATH` to choose a different
+  case, you may also want to use `YABRIDGE_TEMP_DIR` to choose a different
   directory for yabridge to store its sockets and other temporary files in.
 
 ## Performance tuning

src/common/utils.cpp

@@ -37,7 +37,7 @@ constexpr char disable_watchdog_timer_env_var[] = "YABRIDGE_NO_WATCHDOG";
  * other temporary files here instead of in `$XDG_RUNTIME_DIR` or `/tmp`. This
  * is only relevant when using some namespacing setup for sandboxing.
  */
-constexpr char temp_dir_override_env_var[] = "YABRIDGE_TEMP_PATH";
+constexpr char temp_dir_override_env_var[] = "YABRIDGE_TEMP_DIR";
 
 fs::path get_temporary_directory() {
     bp::environment env = boost::this_process::environment();