Pytermtk

Deprecation
In order to have uniform API across the library the [property](https://docs.python.org/3/howto/descriptor.html#id24) should be removed from all the object to allow the [signals/slots](https://ceccopierangiolieugenio.github.io/pyTermTk/tutorial/003-signalslots.html) to be used:
* https://github.com/ceccopierangiolieugenio/pyTermTk/pull/95/commits/d22eba93216dcb67e507e980c262e14bf0cb485e Removed **Data** property and metaClass
* https://github.com/ceccopierangiolieugenio/pyTermTk/pull/95/commits/599aa9144fe116e4abe4ac80505fb3aea0ac3725 Removed **Text** property and metaClass
* https://github.com/ceccopierangiolieugenio/pyTermTk/pull/95/commits/49ad3cdaf10967d86dc078e658feb664a671429b Removed **Color** property and metaClass

What's Changed
* color modifier: linear gradient in arbitrary direction by luchr in https://github.com/ceccopierangiolieugenio/pyTermTk/pull/89
* Gradient by luchr in https://github.com/ceccopierangiolieugenio/pyTermTk/pull/91
* Avoid override of fg/bg in the linear gradient modifier by ceccopierangiolieugenio in https://github.com/ceccopierangiolieugenio/pyTermTk/pull/90
* missing slots and missing __slots__ test by luchr in https://github.com/ceccopierangiolieugenio/pyTermTk/pull/94
* WIP: Widget Progressbar by luchr in https://github.com/ceccopierangiolieugenio/pyTermTk/pull/75
* Luchr progressbar by ceccopierangiolieugenio in https://github.com/ceccopierangiolieugenio/pyTermTk/pull/76
* Added scrollArea missing methods by ceccopierangiolieugenio in https://github.com/ceccopierangiolieugenio/pyTermTk/pull/96
* Strings optimization by ceccopierangiolieugenio in https://github.com/ceccopierangiolieugenio/pyTermTk/pull/97
* Tom (Ttk Object Model) Inspector by ceccopierangiolieugenio in https://github.com/ceccopierangiolieugenio/pyTermTk/pull/95


**Full Changelog**: https://github.com/ceccopierangiolieugenio/pyTermTk/compare/0.14.0-a...0.20.0-a

What's Changed
* Added TTkTextEdit line number by ceccopierangiolieugenio in https://github.com/ceccopierangiolieugenio/pyTermTk/pull/65
* Fix: 67 : Variable width char support by ceccopierangiolieugenio in https://github.com/ceccopierangiolieugenio/pyTermTk/pull/68
* Fix: TTkString alignment (at _hasSpecialWidth) by luchr in https://github.com/ceccopierangiolieugenio/pyTermTk/pull/70
* Fix: TTkButton without borders: use termWidth for text by luchr in https://github.com/ceccopierangiolieugenio/pyTermTk/pull/71
* TTkString: cache special width by luchr in https://github.com/ceccopierangiolieugenio/pyTermTk/pull/74
* Delete variation selector examples in (demo-) test widgets by luchr in https://github.com/ceccopierangiolieugenio/pyTermTk/pull/73
* TTkLabel: use termWidth by luchr in https://github.com/ceccopierangiolieugenio/pyTermTk/pull/72
* Added HScrollbar in the FancyTable 79 by ceccopierangiolieugenio in https://github.com/ceccopierangiolieugenio/pyTermTk/pull/83
* Added Window Close Button 81 by ceccopierangiolieugenio in https://github.com/ceccopierangiolieugenio/pyTermTk/pull/84
* Fix Spinbox error 85 by ceccopierangiolieugenio in https://github.com/ceccopierangiolieugenio/pyTermTk/pull/86
* Window flags 81 by ceccopierangiolieugenio in https://github.com/ceccopierangiolieugenio/pyTermTk/pull/87

New Contributors
* Whidou made their first contribution in https://github.com/ceccopierangiolieugenio/pyTermTk/pull/44
* mgomersbach made their first contribution in https://github.com/ceccopierangiolieugenio/pyTermTk/pull/45
* dehesselle made their first contribution in https://github.com/ceccopierangiolieugenio/pyTermTk/pull/47
* schwehr made their first contribution in https://github.com/ceccopierangiolieugenio/pyTermTk/pull/49
* nat-chan made their first contribution in https://github.com/ceccopierangiolieugenio/pyTermTk/pull/59

**Full Changelog**: https://github.com/ceccopierangiolieugenio/pyTermTk/commits/0.14.0-a