Make Stopwatch.ElapsedTime() a property and TimeSpan
Repurpose unused Timer.cs and add some loading perf metrics
Improve PerfTimer output
Add more perf measurements
Optimize ComputeHash by removing Concat() and ToArray() calls
Fix OpenRA.Lint throwing because "perf" log channel does not exist

Slightly modified the Log class to allow dummy channels that don't
write anywhere, then use it on Lint because map loading writes to
the "perf" channel.
Prettier PerfTimer output
Style fixes
Style fixes
Merge pull request #5184 from pavlos256/loading-perf

Loading performance measurements