~ehmry/nim_tox

Fix tox_conference_delete wrapper
toxcore: fix log callback documentation
Use the upcoming toxav API
Switch to flake development shell
Manage object lifetime with destructors
WiP! av groupchat
Refactor error checks
Fix typo at offflinePeerLastActive
New boostrap JSON format
SPOF bootstrap: Make IPv4 and IPv6 optional
Normalize API for sending messages to conferences
Add boostrap module

Add a submodule for bootstrapping from a centralized node list.
This is not a part of the core module because it introduces a
single-point-of-failure.
Add toxcore/av library
Toxcore: tidy the API
Add sugar for sendChunk
Use Tox header for all imports, especially enums

Passing Nim enum pointers to the C library was trashing the stack.
Add foreignDeps metadata
Nim 1.0.2 compability, nimpretty
REUSE compliant licensing metadata
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