this is for developers/testers

Closes #25

As mentioned in issues, feels like an area that might need other things adding to it as issues are found :)

* Initial commit. Untested

* various fixes

Core functionality confirmed working:
 - Iframe injection into steam client
 - Plugin fetching from the iframe
 - Plugin opening

* Added function to fetch resources from steam

* Improved injector module, added server-js communication

- Injector module now has methods for better lower-level manipulation of the tab debug websocket.
- Our "front-end" can now communicate with the manager (2-way), completely bypassing the chromium sandbox. This works via a dirty debug console trick, whoever wants to know how it works can take a look at the code.
- Added utility methods file, along with an implementation of the aiohttp client that our "front-end" can access, via the system described above.
- Added js implementations of the communication system described above, which can be imported by plugins.

* Added steam_resource endpoint

* Added basic installer script

* retry logic bug fix

* fixed library injection, event propagation, websocket handling

- library is injected directly into the plugins as well as the plugin list
- resolveMethodCall is implemented in the plugin_list.js file, which in turns calls window.sendMessage on the iframe to propagate the event
- websocket method calls are processed in their own tasks now, so as not to block on long-running calls.

Co-authored-by: tza <tza@hidden>
Co-authored-by: WerWolv <werwolv98@gmail.com>