- Updated rust nightly
- Updated depenencies
- Removed unicode support for regex (less dependencies)
- Fixed dependency and nightly changes/deprications
- Some mail changes for less spam point triggering

- Updated crates
- Updated rust-toolchain
- Updated Dockerfile to use latest rust 1.48 version
- Updated AMD64 Alpine to use same version as rust-toolchain and support
  PostgreSQL.
- Updated Rocket to the commit right before they updated hyper.
  Until that update there were some crates updated and some small fixes.
  After that build fails and we probably need to make some changes
(which is probably something already done in the async branch)

- Added an option to enable smtp debugging via SMTP_DEBUG. This will
  trigger a trace of the smtp commands sent/received to/from the mail
server. Useful when troubleshooting.
- Added two options to ignore invalid certificates which either do not
  match at all, or only doesn't match the hostname.
- Updated lettre to the latest alpha.4 version.

This feature enables the `vendored` feature from the `openssl` crate and build a statically linked version of openssl.

General:
- Updated several dependancies

Lettre:
- Updateded lettere and the workflow
- Changed encoding to base64
- Convert unix newlines to dos newlines for e-mails.
- Created custom e-mail boundary (auto generated could cause errors)

Tested the e-mails sent using several clients (Linux, Windows, MacOS, Web).
Run msglint (https://tools.ietf.org/tools/msglint/) on the generated e-mails until all errors were gone.

Lettre has changed quite some stuff compared between alpha.1 and alpha.2, i haven't noticed any issues sending e-mails during my tests.

Diesel requires the following changes:
- Separate connection and pool types per connection, the generate_connections! macro generates an enum with a variant per db type
- Separate migrations and schemas, these were always imported as one type depending on db feature, now they are all imported under different module names
- Separate model objects per connection, the db_object! macro generates one object for each connection with the diesel macros, a generic object, and methods to convert between the connection-specific and the generic ones
- Separate connection queries, the db_run! macro allows writing only one that gets compiled for all databases or multiple ones

Replace IP support in preparation for compiling on stable, included some tests to check that the code matches the unstable implementation

In this implementation, the `TZ` environment variable must be set
in order for the formatted output to use a more user-friendly
time zone abbreviation (e.g., `UTC`). Otherwise, the output uses
the time zone's UTC offset (e.g., `+00:00`).

Update lettre to alpha release instead of git commit, and update the rest of dependencies while we are at it

Make web vault show a more informative error when browsers block WebCrypto in insecure contexts and update dependencies

Primarily updating rocket, which needed some dependencies

Latest versions of:
 - ring
 - time
 - jsonwebtoken
 - yubico
 - rocket (git)

- Use the blocking client (no async).
- Disabled gzip.
- use_sys_proxy is now default.