Add actual effects to the configurations
This extends #104 by adding actual effects to the configurations rather than have them be no-ops. Effects include: * debug instrumentation (new in this PR), for emitting `-g` (see #73 for an obvious extension) * optimization control / WMO control * compression level (faster debug atbins) * test instrumentation (`-enable-testing`) * `#if ATBUILD_RELEASE` etc. from Swift code There are some deprecations associated with this PR: * `whole-module-optimization` atllbuild option is now deprecated; use `--configuration release` instead. There currently is no plan to control these separately, use `--configuration plain` + `:compileOptions ["-O"]` to get optimization without WMO. Or open a bug to complain about this change. * `magic` atllbuild option is now deprecated; to opt out of magic use `--configuration none` instead. Doc PR to follow. In addition, CI is now updated to produce release (optimized) builds for atbuild, which significantly optimizes atbuild performance.
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