Format all source with clang-format.

[jshort]

A clang-format action was added to validate our source files during PR review so this will get our code to be compliant in preparation for that new github action.

[codecov-commenter]

Codecov Report

Base: 71.21% // Head: 71.14% // Decreases project coverage by -0.06% ⚠️

Coverage data is based on head (441daee) compared to base (ce6645f).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #552      +/-   ##
==========================================
- Coverage   71.21%   71.14%   -0.07%     
==========================================
  Files          49       49              
  Lines        3074     3074              
==========================================
- Hits         2189     2187       -2     
- Misses        885      887       +2     

Impacted Files	Coverage Δ
src/base/BackedReader.hpp	100.00% <ø> (ø)
src/base/BackedWriter.hpp	80.00% <ø> (ø)
src/base/Connection.hpp	80.00% <ø> (ø)
src/terminal/Console.hpp	100.00% <ø> (ø)
src/terminal/TerminalClient.hpp	100.00% <ø> (ø)
src/terminal/UserJumphostHandler.hpp	100.00% <ø> (ø)
src/terminal/UserTerminal.hpp	100.00% <ø> (ø)
src/terminal/UserTerminalHandler.hpp	100.00% <ø> (ø)
.../terminal/forwarding/ForwardDestinationHandler.hpp	0.00% <ø> (ø)
src/terminal/forwarding/ForwardSourceHandler.hpp	0.00% <ø> (ø)
... and 6 more

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