fix: misc fixes to swift script on macos, incl URL inspection (#69)

* Missing clean statement in makefile

* Extract url from safari and chrome-like browsers

* Removing system idle time

* Fixed old heartbeat and added log levels

Reason the existing logic wasn't working is the previous heartbeat is not
sent with the current timestamp to the server does not merge it

* Additional comments

* Update aw_watcher_window/macos.swift

* dont' allocate formatter each time

* Drop timestamp interval

* Drop to millisecond subtraction

* Check for empty tab titles before using them in place of the notification-provided window title

Makefile

@@ -24,3 +24,4 @@ package:
 clean:
 	rm -rf build dist
 	rm -rf aw_watcher_window/__pycache__
+	rm aw_watcher_window/aw-watcher-window-macos