0.6.1

Changes since the previous release:

● A Shortcut editor is added to the Preferences dialog for those actions whose shortcuts can be changed safely.
● Multi-line indentation and de-indentation.
● Auto-bracket support.
● Optional showing of whitespaces and line/document ends with syntax highlighting.
● Support Shift+Enter.
● Several improvements in syntax highlighting.
● Better detection of encodings.
● Warning-bar instead of message box.
● An option to use native file dialogs.
● Restoration of the scrollbar position after reloading.
● Filtering for the session manager dialog.
● Additional workarounds for some Qt bugs.
● Many fixes, modifications and improvements.