Robotics Systems Commons

Logging sub-system no longer uses registry in src/rsc/logging/*.{h,cpp}

fixes #1629

A new class LoggingSystemFactory is now responsible for managing known
LoggingSystem implementation as well as creating instances of
those. The built-in logging systems are initially registered in
LoggingSystemFactory's constructor.

• src/rsc/logging/LoggingSystem.{h,cpp} (includes): removed
  ../misc/Registry.h
  (LoggingSystem::getRegistryKey): removed member function; no longer
  needed
  (LoggingSystem::getName): new member function; return name of the
  logging system
  (loggingSystemRegistry): removed; no longer needed
• src/rsc/logging/LoggingSystemFactory.{h,cpp}: new files; singleton
  factory for managing and instantiating LoggingSystem implementations
• src/rsc/logging/ConsoleLoggingSystem.{h,cpp} (includes): removed
  ../misc/Registry.h; added ../runtime/Properties.h
  (ConsoleLoggingSystem::getRegistryKey): removed; no longer needed
  (ConsoleLoggingSystem::create): new static member function; create
  function for use by LoggingSystemFactory
• src/rsc/logging/LoggerFactory.{h,cpp} (includes): removed
  ConsoleLoggingSystem.h; added LoggingSystemFactory.h
  (toplevel): adapted documentation comment w.r.t. logging system
  implementation registration
  (LoggerFactory::DEFAULT_LOGGING_SYSTEM): just use "console"
  (LoggerFactory::reselectLoggingSystem): use LoggingSystemFactory
  (LoggerFactory::getLoggingSystemName): use LoggingSystem::getName
• test/rsc/logging/mocks.h (includes): added rsc/runtime/Properties.h
  (MockLoggingSystem::name): removed; no longer needed
  (MockLoggingSystem::MockLoggingSystem): likewise
  (MockLoggingSystem::getRegistryKey): likewise
  (MockLoggingSystem::getName): new member function; required by
  interface
  (MockLoggingSystem::create): new static member function; required by
  LoggingSystemFactory
• test/rsc/logging/LoggerFactoryTest.cpp (includes): added
  rsc/logging/LoggingSystemFactory.h
  (test LoggerFactoryTest::testReselectLoggingSystem): adapted but
  disabled since it didn't work
  (test LoggerFactoryTest::testRootLoggerCorrectLevelAfterReselect):
  adapted
• test/rsc/logging/OptionBasedConfiguratorTest.cpp (includes): added
  rsc/logging/LoggingSystemFactory.h
  (test OptionBasedConfigurationTest::testSystemSelection): adapted
  but disabled since it didn't work