feat(preferences): password constraints for SQL sources

Initial implementation of some password policy support for SQL sources.

UI/PreferencesUI/UIxPreferences.m

@@ -38,6 +38,7 @@
 #import <SOGo/SOGoUser.h>
 #import <SOGo/SOGoUserSettings.h>
 #import <SOGo/SOGoSieveManager.h>
+#import <SOGo/SOGoSource.h>
 #import <SOGo/SOGoSystemDefaults.h>
 #import <SOGo/SOGoUserFolder.h>
 #import <SOGo/SOGoParentFolder.h>
@@ -250,6 +251,17 @@ static NSArray *reminderValues = nil;
   return shortDateFormatText;
 }
 
+//
+// Used by wox template
+//
+- (NSArray *) passwordPolicy
+{
+  NSObject <SOGoSource> *userSource;
+
+  userSource = [user authenticationSource];
+  return [userSource userPasswordPolicy];
+}
+
 //
 // Used internally
 //

UI/Templates/PreferencesUI/UIxPreferences.wox

@@ -282,6 +282,13 @@
                 <label><var:string label:value="New password"/>
                 </label>
                 <input type="password" sg-no-dirty-check="true" ng-model="app.passwords.newPassword"/>
+                <div class="sg-hint">
+                  <ul class="sg-padded">
+                    <var:foreach list="passwordPolicy" item="item">
+                      <li><var:string value="item.label"/></li>
+                    </var:foreach>
+                  </ul>
+                </div>
               </md-input-container>
               <md-input-container class="md-block" flex="flex">
                 <label><var:string label:value="Confirmation"/>