Add ability to associate a colour to a tag

[adil-hussain-84]

I'm enjoying the tag feature and I like how a tagged Ayah appears as highlighted in the Mushaf. It would be great to associate a colour to a tag and for this colour to be used as the highlight colour. So, for example, I'd associate green to Ayahs tagged as "Character" and blue to Ayahs tagged as "Dua". Then, when I'm casually reading through the Mushaf and I see a highlighted Ayah, the colour straight away tells me what that highlight represents.

It would be great also to colour each tag in the Bookmarks tab using the colour that is associated to that tag.

Given that Ayah bookmarks are conflated conceptually to tagged Ayahs, it may make sense to associate Ayah bookmarks to colours also.