Implementing base class methods for easy component configuration:

Implementing base class methods for easy component configuration:
- AliHLTComponent::ConfigureFromArgumentString implements the common
  parsing and loop over all arguments. Fits both for single strings
  containing several blank separated arguments as well as an array
  of arguments.
- AliHLTComponent::ConfigureFromCDBTObjString loads the specified
  OCDB object and calls the argument parsing for all objects of
  type TObjString
- AliHLTComponent::LoadAndExtractOCDBObject helper function to
  access OCDB objects from components
- AliHLTComponent::ScanConfigurationArgument is defined and needs to
  be implemented in order to support the argument scan

Updated component base class documentation

Added test to AliHLTComponent unit test