Redo request work with httpx for async

[palfrey]

This solves #22. I've done some limited local testing, but wasn't sure how to test better. I've used the following script to do testing as well as with my local home assistant

import queue
import media_player
import asyncio
import _thread
import time

def handler(self, context):
    print(self, context)

q = queue.Queue()

class Hass:
    pass

async def main():
    hass = Hass()
    hass.loop = q.get()
    config = media_player.PLATFORM_SCHEMA({"device": "<live id>", "platform": "xboxone", "host": "<xbox ip>"})

    devices = []
    add_devices = lambda device: devices.extend(device)
    await media_player.async_setup_platform(hass, config, add_devices)
    for d in devices:
        print(d.__dict__)
        await d.async_update()
        print("updated")
        print(d._xboxone.all_apps.keys())
        print(d.source_list)       
        print(d.__dict__)

def event_thread():
    loop = asyncio.new_event_loop()
    loop.set_debug(True)
    asyncio.set_event_loop(loop)
    print("event loop", loop)
    q.put(loop)
    loop.run_forever()


_thread.start_new_thread(event_thread, ())
time.sleep(2)
print("main")
asyncio.run(main())

[tuxuser]

Thanks for your contribution!

Ideally we could upstream this branch of xbox-smartglass-core-python: https://github.com/OpenXbox/xbox-smartglass-core-python/tree/task/asyncio

Leftover bugs

• add_manager functionality does not work, cause CoreProtocol is not set until the asyncio loop is actually started..

Benefits

• No more REST server wrapping the core library, the library functions can be called directly
• Authentication and more important, refreshing tokens, can be handled by Home Assistant directly.

Unfortunately I didnt find a sane solution for the add_manager bug yet - assistance happily appreciated.