Implement Password Health Report

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

src/core/PasswordGenerator.cpp

@@ -19,7 +19,6 @@
 #include "PasswordGenerator.h"
 
 #include "crypto/Random.h"
-#include <zxcvbn.h>
 
 const char* PasswordGenerator::DefaultExcludedChars = "";
 
@@ -31,11 +30,6 @@ PasswordGenerator::PasswordGenerator()
 {
 }
 
-double PasswordGenerator::estimateEntropy(const QString& password)
-{
-    return ZxcvbnMatch(password.toLatin1(), nullptr, nullptr);
-}
-
 void PasswordGenerator::setLength(int length)
 {
     if (length <= 0) {