Feature/editor improvements

[maciekswat]

Few Improvements

1. added automatic closing of brackets, and quotes so that when you type you don't need to type ( and then ) you just type ( and closing bracket is displayed automatically and cursor is positioned in the correct place. This option in ON by default
2. Added auto-save - ON by default
3. restored missing configuration.ui and fixed persistence of boolean settings - OFF settings were not persisted
   Here is summary of the new settings dialog and it also whos new features - auto-match characters and autosave

[fyffep]

Aside from the concern about auto-save, this looks good. I researched a few things about how Qscintilla handles key events.

[fyffep]

This may cause a performance degradation or a stuttering feeling while typing. I recommend changing it.

Options:

1. Change the default to every 1 minute. While 5-10 minutes is more common in other software, Twedit mainly operates on small text files.
2. Make Twedit autosave after every keystroke instead of using a time-based saver.