Add new cog: Croissants screengrab

[leo-chartier]

Add a cog to automatically save a message by creating a "screenshot" of it if it matches a certain regex.

[PaulMarisOUMary]

Tested with :
python: 3.10.0
discord.py: 2.0.0a

Please update your PR with the following changes, using discord 2.0.0a (install the devellopement version here) and with python 3.10.0 or higher.

Errors :

- 2.0.0a Member attribute error

Ignoring exception in on_message
Traceback (most recent call last):
  File "\Python\Python310\lib\site-packages\discord\client.py", line 351, in _run_event
    await coro(*args, **kwargs)
  File "\Desktop\Algosup-Discord\cogs\croissants.py", line 32, in on_receive_message
    file=self.__get_screenshot(author, message)
  File "\Desktop\Algosup-Discord\cogs\croissants.py", line 55, in __get_screenshot
    pfp = Image.open(BytesIO(requests.get(author.avatar_url).content))
AttributeError: 'Member' object has no attribute 'avatar_url'

changes : Solved
\cogs\croissants.py line 55

pfp = Image.open(io.BytesIO(requests.get(author.display_avatar.url).content)) # Since version 2 of discord.py avatar_url is deprecated, use display_avatar.url instead

- Message type is not iterable

Ignoring exception in on_message
Traceback (most recent call last):
  File "\Python\Python310\lib\site-packages\discord\client.py", line 351, in _run_event
    await coro(*args, **kwargs)
  File "\Desktop\Algosup-Discord\cogs\croissants.py", line 32, in on_receive_message
    file=self.__get_screenshot(author, message)
  File "\Desktop\Algosup-Discord\cogs\croissants.py", line 66, in __get_screenshot
    draw.text((99, 48), content, content_color, content_font)
  File "\AppData\Local\Programs\Python\Python310\lib\site-packages\PIL\ImageDraw.py", line 393, in text
    if self._multiline_check(text):
  File "\AppData\Local\Programs\Python\Python310\lib\site-packages\PIL\ImageDraw.py", line 368, in _multiline_check
    return split_character in text
TypeError: argument of type 'Message' is not iterable

changes : Solved
\cogs\croissants.py line 66

draw.text((99, 48), str(content), content_color, content_font) # Cast Message in string

- Image File is empty

Unsolved