Accessing ErrorsPad via the PadsCollection to be compatible with
MonoDevelop 5.0.
appVersion will now be inserted during configuration.
addin-project-xml will be created automatically.
Ignoring automatically created addin-project.xml file.
Detecting major application version now and replacing the markers INSERT_MAJORAPP_VERSION in addin-project.xml + MonoDevelop.StyleCop.addin.xml
Removing addin-project.xml now in case of distclean