Add a new Ginga SVG icon

[ejeschke]

Adds a new SVG based icon for Ginga.

• fixes #804

[ejeschke]

@olebole, a couple questions for you, if you'd be so kind:

• do I need to save the SVG icon with a "preferred size" (I know they are vector drawings, but it seems there is some "default size" set inside it)? Or is the one that I have added here ok?
• how should I change ginga.desktop so that the icon path is set correctly?

[pllim]

So with this patch, this this file outdated?

https://github.com/ejeschke/ginga/blob/master/ginga/icons/ginga-512x512.png

[olebole]

For, this looks nice. I don't need a "preferred size". In ginga.desktop, you just need to add ginga.svg as you did, and install the icon file where it can be found (/usr/share/pixmaps on Debian).

[ejeschke]

and install the icon file where it can be found (/usr/share/pixmaps on Debian).

Can your Debian packaging script for apt put it in the right place if it is in ginga/icons in the repo or ginga/icons in the PyPI package?

[ejeschke]

So with this patch, this this file outdated?

https://github.com/ejeschke/ginga/blob/master/ginga/icons/ginga-512x512.png

Possibly. I'll do a quick check to see if it is used anywhere and add its removal to this PR if not.

[olebole]

@ejeschke

Can your Debian packaging script for apt put it in the right place if it is in ginga/icons in the repo or ginga/icons in the PyPI package?

The Debian package will put it to the right place, so after "apt install ginga" all will be fine.

[ejeschke]

@pllim, are you ok with the design? If not, maybe accept for now and we figure out a different one later?

[pllim]

I don't have any opinion on the logo. Feel free to merge. Thanks!

[ejeschke]

ginga-512x512.png is currently used by one of the examples. We will keep it in the repo for the present.

[ejeschke]

Thank you @pllim and @olebole!