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Restyle Separate System::Layer and Timer into per-implementation files. #8815

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@restyled-io restyled-io bot commented Aug 5, 2021

A duplicate of #8800 with additional commits that automatically address
incorrect style, created by Restyled.

⚠️ Even though this PR is not a Fork, it contains outside contributions.
Please review accordingly.

Since the original Pull Request was opened as a fork in a contributor's
repository, we are unable to create a Pull Request branching from it with only
the style fixes.

The following Restylers made fixes:

To incorporate these changes, you can either:

  1. Merge this Pull Request instead of the original, or

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    the original Pull Request

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    git merge --ff-only FETCH_HEAD
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kpschoedel and others added 6 commits August 4, 2021 18:20
#### Problem

Various implementations of System::Layer are provided by `#if` sections,
which prevents mock versions for testing and out-of-tree platform
implementations.

#### Change overview

Split platform `#if` sections of `System::Layer` and `System::Timer`
into separate `WatchableEventManager` implementations.

This change does for timers what PR #6561 did for socket I/O events.
The intent is that the public `WatchableEventManager` interface here
will become pure virtual methods of `System::Layer`, and the various
versions of `WatchableEventManager` will become its implementations.

`System::Timer` remains as an `Object`-pool based utility class for
implementing the Timer API.

- Make `Timer` list not LwIP-specific, mutex it, and use it in preference
  to iterating through the entire pool.
- Move `IsEarlier` from `Timer` to `Clock`.
- Fix dual definitions of `Clock::Platform` functions on Linux.

#### Testing

Relying on CI in general, since no externally visible functionality
should have changed. Sanity-checked the libevent implementation (not in
CI) using chip-tool.
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