[FEATURE] Additional shape parameters

[VadimDubovoy]

Hi, it would be great to have adjustment properties like rectRadius for ROUNDED_RECTANGLE, but for other shapes which do not support such properties yet. Such as: ROUND_2_DIAG_RECTANGLE , ROUND_2_SAME_RECTANGLE , SNIP_2_DIAG_RECTANGLE, SNIP_2_SAME_RECTANGLE, RIGHT_ARROW, LEFT_ARROW, LEFT_RIGHT_ARROW.

Thanks for this wonderful library and your efforts.