Release v0.12.2-beta

[saubyk]

Maintenance release with minor updates and bug fixes.
https://github.com/Ride-The-Lightning/RTL/releases/tag/v0.12.2

Minor enhancements:

• Navigate to inactive channels from the dashboard
• Navigate to individual channels from the dashboard

Implementation specific changes:

C-Lightning:

• Failed transaction routing pages with more details

LND:

• Dedicated page for analysis on non-routing peers
• Specify limits with fractional percentage for routing fee on circular rebalancing