Different queue for each voice channel

[javdc]

Now each guild (server) has its very own sound queue, and multiple guilds can listen to the bot simultaneously.

[Wikijito7]

Waiting for new tests in dev execution between servers to merge.

[Wikijito7]

Crash after adding a lot of sounds to queue and then leaving without finishing it to add them while being connected on voice channel.

ERROR:root:on_command_error >> Exception caught when running command
Traceback (most recent call last):
  File "/home/wokis/.local/lib/python3.9/site-packages/discord/ext/commands/core.py", line 235, in wrapped
    ret = await coro(*args, **kwargs)
  File "/home/wokis/ecibot-dev/main.py", line 259, in youtube
    await add_to_queue(ctx.guild.id, ctx.author.voice.channel, ctx.channel, sound)
AttributeError: 'NoneType' object has no attribute 'channel'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/home/wokis/.local/lib/python3.9/site-packages/discord/ext/commands/bot.py", line 1350, in invoke
    await ctx.command.invoke(ctx)
  File "/home/wokis/.local/lib/python3.9/site-packages/discord/ext/commands/core.py", line 1029, in invoke
    await injected(*ctx.args, **ctx.kwargs)  # type: ignore
  File "/home/wokis/.local/lib/python3.9/site-packages/discord/ext/commands/core.py", line 244, in wrapped
    raise CommandInvokeError(exc) from exc
discord.ext.commands.errors.CommandInvokeError: Command raised an exception: AttributeError: 'NoneType' object has no attribute 'channel'
ERROR:root:on_command_error >> Exception caught when running command
Traceback (most recent call last):
  File "/home/wokis/.local/lib/python3.9/site-packages/discord/ext/commands/core.py", line 235, in wrapped
    ret = await coro(*args, **kwargs)
  File "/home/wokis/ecibot-dev/main.py", line 259, in youtube
    await add_to_queue(ctx.guild.id, ctx.author.voice.channel, ctx.channel, sound)
AttributeError: 'NoneType' object has no attribute 'channel'

[Wikijito7]

When adding a new video, it may block the thread enough time to execute skip and make the bot disconnect with sounds on the queue as it is marked as ready to be removed but there are content on the queue.

We should double check if the bot was marked as ready to remove but there are content (that may happen) and remove this state in order to mantain it playing.

[Wikijito7]

This branch will be merged to solve errors from main branch.