Feature request: tag hierarchy

[pchampin]

I would be nice if the Tags list could have a hierarchical structure, based on naming conventions in tags. For example

---
tags:
    - Project A:WP1
    - Project A:WP2
---

currently appears as

🏷 Project A:WP1
🏷 Project A:WP2

but it would be nice to display it like:

🏷 Project A
    🏷 WP1
    🏷 WP2

[pchampin]

Comments:

• this could of course be optionally enabled/disabled in the settings
• the colon (:) character is just a suggestion here; probably, this could also be customizable