Add option to not show dignities of planets

[afucher]

Is your feature request related to a problem? Please describe.
When showing the planets inside the chart, AstroChart always show with a character the dignity of the planet. Sometime I do not want to show this to the user, to have a cleaner view of the chart.

Describe the solution you'd like
Add a setting to configure if it should show or not.

Describe alternatives you've considered
None.