... ignoring a error code of 0 from Make. This is necessary to
detect build failures on symbian

Do not show errors when ignoring the return value of a BuildStep
either.

Task-number: QTCREATORBUG-985
Reviewed-by: dt

 * Do not report make warnings at all.
 * Do only report the first make error.
 * Do not report any make errors after a compile error.
 * Handle more variants of mingw makes
 * Actually parse stderr for errors

 * Report errors in Makefiles
 * Skip all but the first fatal error

 * Improve parser to recognize gnu make errors.

Since otherwise we can't forward declare it.

 * Rework IBuildParser:
    * Remove name() method.
    * Remove enterDirectory and leaveDirectory signals.
    * Allow chaining of parsers.
 * Rename IBuildParser to IOutputParser.
 * Implement GnuMakeParser.
    * Remove entering/leaving directory related code from all other parsers
    * Move filename fixup heuristic based on entering/leaving directory
      massages from gnumake here from AbstractMakeStep.
 * Add outputParser method to ToolChain: This removes the need to map
   toolchains to BuildParser names in the BuildSteps.
 * Enhance AbstractProcessStep to accept a IOutputParser to parse its output.
 * Remove AbstractMakeStep.
 * Set the appropriate Parsers in all classes deriving from AbstractProcessStep
   and append the ToolChain's parser to the parser chain.
 * Remove BuildParserFactories: There is no more need for them.
 * Remove constants used to identify the BuildParsers.
 * Clean up some names:
    * Replace stdOut with stdOutput.
    * Replace addToTaskWindow with addTask and addToOutputWindow with
      addOutput. Do this wherever it is not yet clear that this will end up
      in the Task/Output window.

Reviewed-by: dt