Feature Request: msgtype configurable

Hello,

first of all thanks for this special bot! ❤️

can we make the msgtype configurable?
per default the msgtype is m.notice

example:
```
{
"content": {
"msgtype": "m.notice",
"body": "@user:my.domain, You’re so special.",
"format": "org.matrix.custom.html"
},
"type": "m.room.message",
"room_id": "!xXXXxxxXxxXXxXx:my.domain"
}
```

would be nice to have a configuration option in commands.yaml like:
```
hello:
regex: "^salut$|^ciao$|^hallo$|^hi$|^servus$|^hola$|^hello$|^hello .*$|^bonjour$|^bonne nuit$|^hello.sh$"
cmd: hello.sh
help: gives you a friendly compliment
message_type: text
markdown_convert: false
formatted: true
code: false
```

I try to force it in `chat_functions.py` but the bot doesn't start after changing

Thanks in advance