missing http status codes added

[Zhavok92]

No description provided.

[The-EDev]

I'm sorry for the late response, I was occupied with another PR, I have a few concerns about some of the codes added, I'll list them in the next comment.

[The-EDev]

I've looked into the added codes, here are my observations:

• 102 - webdav only

• 103 - seemingly no compatibility (not sure what to do about it)

• 207, 208 - Webdav again

• 226 - Crow doesn't support delta encoding by default (just a note)

• 305, 306 - Deprecated (definitely remove)

• 402, 425 - Seems experimental (not sure what to do about them)

• 406 - Crow doesn't support Server-driven content negotiation by default (just a note)

• 408 - Crow shuts down connections without sending this, will require changes to connection.h (definitely remove)

• 411, 412, 414, 421, 426, 431 - They feel like they shouldn't be sent by a user, rather by crow itself.. which crow doesn't send currently (suggest removal)

• 418 - Crow doesn't support coffee-scheme unfortunately (definitely remove)

• 422, 423, 424 - Webdav

• 504, 505 - They feel like they shouldn't be sent by a user, rather by crow itself.. which crow doesn't send currently (suggest removal)

• 507, 508 - Webdav once more

• 510 - Crow doesn't support HTTP extension (suggest removal)

• 511 - usually generated by proxies, crow is not meant to be a proxy (definitely remove)

For webdav codes, I suggest removing them since Crow neither supports webdav nor webdav HTTP methods, both can be added in a later PR if needed.

[Zhavok92]

Thanks for response, I have removed the changes you mentioned.