Added Tests/Examples for the more advanced use cases
* using custom allocation (e.g. C-style malloc)
* using placement new
* creating Objects via private ctor
* example for the 'PImpl' pattern
- to make it similar to Cehteh's tests, moved my testcode to tests/components
- made scons build the errortest and plugin-example as well
- scons check will run the suite
please note, my implementation work is quite incomplete (warnings, app shuttdown
not yet implemented); I hadn't success running the plugintest.