Add the lld dependency to the debian package build and to the edependency for CI

If you are going to do that, you need to add test for the serialization routines. I don't see what making these constexpr really benefit anything. The optimizer is likely able to do it anyways.

That's good stuff!

More of a question that a change request, but please double check this.

Fix comments

Minor operation reordering.

Why simply not adding src to the path?

Fix merge conflict in processor.cpp

rebase

Fix warnings in bitcoin-qt and log due to an error in the the required descriptor count calcuation.

Reduce the max connection used by default in integration tests as to not exaust the available file descriptors when many nodes are running at once.

Can you change the diff title? These "Patching foo" is completely redundant. Yes, this is a patch. That tell us nothing about what this does. Failure to be specific is already having an impact on this diff, asyou are throwing in various other stuff that are "geographically" related, as in they happen in the same area of the code, but are semantically unrelated.

rebase

I don't see any reason to block this PR due to existing code that could be better.

Superseeded by D8603

rebase

Add circular dependency.

Please use fbt. Our other stuff use fbt.