Introduce a password health check to the application that evaluates every entry in a database. Entries that fail various tests are listed for user review and action. Also moves the statistics panel to the new Database -> Reports widget. Recycled entries are excluded from the results.
We now have two classes, PasswordHealth to deal with a single password and HealthChecker to deal with all passwords of a database.
Tests include passwords that are expired, re-used, and weak.
* Closes#551
* Move zxcvbn usage to a centralized class (PasswordHealth) and replace its usages across the application to ensure standardized interpretation of entropy calculations.
* Add new icons for the database reports view
* Updated the demo database to show off the reports
With the Material Design icons, any other icons brought in through
the system icon theme will look inconsistent.
Also remove the KEEPASSXC_IGNORE_ICON_THEME environment variable
(which was introduced during development of the new icons to
disable the system icon theme and is thus no longer needed).
Fixes#475
Use the following to run KeePassXC with the icons from the
source code, ignoring the operating system's Qt icon theme:
```
KEEPASSXC_IGNORE_ICON_THEME=1 keepassxc
```
The patch further adds a script `makeicons.sh` that re-creates KeePassXC
icons from the Material Design icon set and can be used for easily
updating icons in the future. Instructions are in the script.
Fixes#475
