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* Support run GHC's test from hadrian.

1. Necessary command line arguments to run test driver.
   + `--test-only=<TEST_CASE>`
   + `--test-skip-perf`
   + `--test-summary=<SUMMARY_FILE>`
   + `--test-junit=<SUMMARY_FILE>`
   + `--test-config=<EXTRA_TEST_CONFIG>`
2. Synchronize configurations from test.mk.
3. Synchronize GHC's compilation flags from test.mk (that's very important).

* The `RunTest` builder and `test` rule to run GHC's test.
* Timeout rules.
* Reduce boilerplate.
* Fix warning.
* Move getTestArgs into Settings.Builders.RunTest.
* Drop `validate` related code to avoid confusion.
* Replace explicit `chmod +x` with `makeExecutable`.
* Fix executable's extension.

See #440

* Implement documentation building

* Clean up for merge

* Move buildRoot into the Action monad, so it can be configured from command line in future

* Move settings from Setting.Path to Base and Context

* Simplify build rule matching and prepare to factoring out common build rules into the library, #347

* Get rid of unsafePerformIO using shakeExtra
* Move diagnostic info utilities to the library

See #347

See #347

See #347

See #347

See #347

See #265

Signed-off-by: Michal Terepeta <michal.terepeta@gmail.com>

See #268.

See #235.

See #223.

See #207.

See #187. [skip ci]

See #187.

See #187.