Bug 130500

As a supported platform, LibreOffice for macOS lacks dedicated icon theme that blends natively to the system. In the previous discussion here (https://bugs.documentfoundation.org/show_bug.cgi?id=42082) we could find many different suggestions about which icon theme should be set as default for macOS platform. From my point of view, using current available icon theme in the core is not the right choice. Breeze theme should be dedicated for KDE Plasma 5, while Sifr are intended to be the theme for accessibility and Colibre is the only Windows-y choice. 

So let me introduce a brand new icon theme: Sukapura, the name is taken after a kingdom of my hometown Tasikmalaya. Here some of Sukapura's fact

- Based on Colibre theme, so it is flat by design. While it is based on Colibre but the design is not merely the same. Other than the colors palette follow macOS standard system colors (https://developer.apple.com/design/human-interface-guidelines/macos/visual-design/color/) that will eventually give maximum blendity to the system, Sukapura use different geometrical shape such as arrow comparing to Colibre's.

- Has full SVG support, so likely it has big advantage for future need, like HIDPi support etc.

- As I write this bug report, Sukapura could be considered 99% finished. So it will not fallback to other theme. The last things that should be taken care is adding localization support for some of formatting toolbar (B,I,U, etc).

Everyone could test by installing it from my Github repo:

https://github.com/rizmut/libreoffice-style-sukapura

Look at the screenshot:

https://raw.githubusercontent.com/rizmut/libreoffice-style-sukapura/master/preview.png

Try it with extension:

https://github.com/rizmut/libreoffice-style-sukapura/blob/master/build/Sukapura-IconSet.oxt


For someone who concern about larger installation size, may be we should consider to remove Tango as it's not relevant now (GNOME 3 has join flat design trend finally) and no one interested to maintain it. But it just a choice of course.