Browserdebuggertools

- Fixed memory leak

Added ChromeInterface methods for set_basic_auth and set_request_headers

* Improved performance of waiting for result messages.
* Changed interface of set_network_emulation to make it more robust.

* Added some specialised functions including `execute_javascript()`, `get_url()` and `get_page_source()`

* Split socket handling from the
* Removed private methods
* Removed default domains as they aren't needed to use the
* Replaced `pop_messages()` with `find_result()`, `get_results()`, `clear_results()` and `
* Added `execute_async()` to replace `run_async` context
* Handle errors better, Added relevant exceptions
* Persisted domains

A devtools client for Chrome with single tab support.