soywod/himalaya v1.0.0-beta.2 on GitHub

Added cargo feature wizard, enabled by default.
Added one cargo feature per backend feature:
- account including account-configure, account-list, account-sync and the account-subcmd
- folder including folder-add, folder-list, folder-expunge, folder-purge, folder-delete and the folder-subcmd
- envelope including envelope-list, envelope-watch, envelope-get and the envelope-subcmd
- flag including flag-add, flag-set, flag-remove and the flag-subcmd
- message including message-read, message-write, message-mailto, message-reply, message-forward, message-copy, message-move, message-delete, message-save, message-send and the message-subcmd
- attachment including attachment-download and the attachment-subcmd
- template including template-write, template-reply, template-forward, template-save, template-send and the template-subcmd
Added wizard capability to autodetect IMAP and SMTP configurations, based on the Thunderbird Autoconfiguration standard.
Added back Notmuch backend features.

Renamed folder create to folder add in order to better match types. An alias has been set up, so both create and add still work.

Fixed default command: running himalaya without argument lists envelopes, as it used to be in previous versions.
Fixed bug when listing envelopes with backend = "imap", sync.enable = true and envelope.watch.backend = "imap" led to unwanted IMAP connection creation (which slowed down the listing).
Fixed builds related to enabled cargo features.