* Added donut chart option to pie chart example

* Increased example description buffer size

* Testing mouse trail building

* Removed unused variable

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Co-authored-by: Gideon Serfontein <gse@newspacesystems.com>

* Added shapes_pie_chart example

* Made the example colorful

* Added some interactivity to the example

* Revert top comment to the standard

* Remove unused MAX_SLICES constant

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Co-authored-by: Gideon Serfontein <gse@newspacesystems.com>
Co-authored-by: Ray <raysan5@gmail.com>