3Bot IMAP/WebDAV/CalDAV backend

[timurgordon]

As a proof of concept, we want to see if we can connect our 3Bot to out phone's mail calendar ecosystem. Ideally would be done in V but we can start with a go library and port it to V after POC, or perhaps keep in go.

The mail backend poc requires running an IMAP server and connecting it to several mail clients.
Likewise, the CalDAV backend requires a CalDAV server and connecting it to several calendar clients.

[timurgordon]

• Related discussion in v
• Simple client in go

[timurgordon]

Started working on porting a minimal go IMAP client: https://github.com/timurgordon/go-imap
IMAP Backend POC work here

[timurgordon]

Tasks

• Create POCs to show that 3Bot in V can be the backend of stateless go IMAP/DAV interfaces freeflowuniverse/3bot_imap_caldav_poc#1
• Create 3bot models for mail, documents, calendar structures freeflowuniverse/3bot_imap_caldav_poc#2
• Create JSON-RPC ws client/server for 3bot to communicate with go IMAP/DAV interfaces freeflowuniverse/3bot_imap_caldav_poc#3
• Create go IMAP/WebDAV/CalDAV interfaces freeflowuniverse/3bot_imap_caldav_poc#4

[despiegk]

please make sure all code is integrated in this repo