Fixed refresh on color setters, stroke, point size, divider draw first and last

[delitestudio]

With this pull request those setters will refresh their value on the fly:

• setStrokeWidth
• setStrokeColor
• setStrokeCap
• setPointSize
• setPointStartColor
• setPointEndColor
• setDividerColor
• setDividerDrawFirst
• setDividerDrawLast

Those setters must be fixed:

• setStartAngel
• setSweepAngel
• setStartValue
• setEndValue

Those setters must be implemented:

• setDividerSize
• setDividerStep