API-based integration with `obsidian-icon-folder` plugin

[SebastianMC]

Under #60 the basic integration with obsidian-icon-folder plugin was introduced.
The connection between the plugins is based on direct access to internal data of the obsidian-icon-folder plugin. That's a reason why the integration is limited: only icons configured directly on folders and files are considered, ignoring the inherited or regexp-applied icons. Also, such kind of integration introduces a tight-coupling: if the obsidian-icon-folder plugin changes its internal data structures, the integration will no longer work.

To address this long term an explicit request to the author of obsidian-icon-folder was supplied:

• #155: [Technical feature request] Expose synchronous API function - getting icon name by path of folder or file

If the above ticket is completed, the integration can be switched to be API-based, and in result:

• handle all methods of applying icon to folders and notes
• be shielded from changes of implementation of obsidian-icon-folder

[replete]

I just wanted to say that I've had no conflicts between with your plugin and obsidian-icon-folders.

I've had problems with obsidian-icon-folders losing my icon assignments unexpectedly. It's happened a few times and I'm expecting it to happen again with some other plugin update. If/when your plugin supports setting icons by sortspec, I will definitely switch over because its such a waste of time re-assigning icons.

Great work on this plugin.