Avtdl

In rplay monitor fix media_url generation

Breaking change in configuration:
- the way chains work has changed: records only propagate through filters and actions in the chain they have originated in. See [README](README.mdchains) for detailed explanation
- in `execute` plugin `placeholders` parameter has been removed, `command` now uses regular {}-placeholders like everything else

New plugin `filter.format.event`, similar to `filter.format` but producing Events instead of TextRecords.

Added tests for chains logic. It necessitated adding some helper actions and methods.

License changed to MIT.

Versions scheme is now going to get closer to semantic versioning.

**Full Changelog**: https://github.com/15532th/avtdl/compare/v0.9.23.4...v1.0

Additional fixes for Windows build

**Full Changelog**: https://github.com/15532th/avtdl/compare/v0.9.23.3...v0.9.23.4

Multiple small fixes, most notable workaround for aiodns getting installed on Windows

**Full Changelog**: https://github.com/15532th/avtdl/compare/v0.9.23.2...v0.9.23.3

Update "rplay" plugin interface.

**Full Changelog**: https://github.com/15532th/avtdl/compare/v0.9.23.1...v0.9.23.2

Fix stderr not being written to file by subprocess in `execute` plugin.