fixes #828

fixes #826

Closes gh-815

closes #806

closes #805

Since the principal not necessarily is json-searializable we need to
avoid this and just pass the wanted properties to thymeleaf

fixes #799

When the base-path for the actuator is set to `/` on spring boot 2 the
endpoints can't be queried via the actuator index and need to be probed.
Therefore we need to probe not only for the old names but also for the
names in boot 2.0.

fixes #793

closes #792

fixes #789

Everythind that looks like an http(s) url will be rendered as hyperlink
and ansi-color escapes are now supported.

In order to have ansi-colors in the file output you need to set a custom
pattern. e.g.:
logging.pattern.file="%clr(%d{yyyy-MM-dd HH:mm:ss.SSS}){faint} %clr(%5p) %clr(${PID}){magenta} %clr(---){faint} %clr([%15.15t]){faint} %clr(%-40.40logger{39}){cyan} %clr(:){faint} %m%n%wEx"

closes #670