I rewrote the router's boundary management part to implement dynamic management from a high-level box interface. This also includes a number of changes I made in the process of rewriting some messy parts, such as the Outbound tree bottom-top starter.

What I reallly need is someone how is experianced in this project (like@nekohasekai) to check my changes and verify everything good and I didn't forget anything. I'm planning to run my project on it, so wait for more improvements in the future =)