Removes split pre-compiled compiler interface

Only base version version is packaged (and not used at runtime). The source bundle is used at runtime.
Merge pull request #699 from skyluc/issue/no-need-specific-compiler-interface

Removes split pre-compiled compiler interface
More informative logging about resetting compilers.

Slightly changed the deprecation warning test, trying to work around possible
race condition.
Merge pull request #700 from dragos/issue/flaky-deprecation-warning-test

More informative logging about resetting compilers.