Do not use type string for enumerations

[tgpetrov]

Currently there are a lot of properties that look like enumerations but are of type string. For example Chart's pointSelectionMode, Calendar's viewMode, DataForm's commitMode, etc. We should change them to enumerations and release major versions of the related plugins.

• AutoComplete - Released
• Calendar - Released
• Chart - Released
• DataForm - Released
• Gauge - Released
• ListView - released
• SideDrawer - Released

[DimitarTodorov]

AC:

• Properties should be applied when set from both xml and code behind - with Enum values.
• Available enum values should be described in a documentation