mark bots as such

[r10s]

recent Android and iOS apps started to mark bots as such, would be nice to have that on desktop as well.

• above the chat, show "Bot" (string bot) instead of the email address in the subtitle ¹
• in the profile, replace the title "Contact" by "Bot"

to check the state, there is dc_contact_is_bot()

for testing, send a message to [email protected]

this is what it would look like:

additional marking of bots is not required nor wanted for now, related PR on android and iOS, including more screenshots and more reasoning:
deltachat/deltachat-android#3220
deltachat/deltachat-ios#2264

Footnotes

1. to not clutter UI, the email address should not be shown additionally. for chatmail, it is anyways in the profile, and there are ongoing discussions that it is better to have it unconditionally there - to prevent over-the-shoulder attacks in general, and to have always the same way to access the address. also, there is multi-transport arising ... tl;dr don't think much about that for bots :) ↩