neues Attribut "active" in Account
Client gibt acitve und -inaktive Accounts zurück
wenn es inaktive Accounts gibt, wird ein separater Eintrag in der Seitenleiste gezeigt
Accounts können über das Kontextmenü (de)aktiviert werden
removing the Account functions from the client
removing the inactive Account Entry from the sidebar
adding a button to the AccountListView to hide the inactive accounts
making the "inactive accounts" button checked
saving and loading the checked state in the ClientEditor PreferenceStore
encapsulated the setting of the AccountList input to account for the filter
accounting for inactive accounts in dialogs
adding option to activate the account again if it is deactivated
Preselect account and portfolio in dividend/buy/sell dialog
Fix: Export crashes when writing Null values to CSV
Polishing feature to hide inactive (retired) accounts

- new icon to represent filter
- renamed property to retired to be consistent with security
- externalized and translated strings
- bumped up file layout version
Merge branch 'feature_account_filter'