refactoring of XML validation: consider schema version number read from document, use single class for validating all vecto-related xml files

change method to obtain vecto version number: instead of reading out from dll, use (same) t4 macro to statically compile the version number as static property; slightly adapt build process to compile t4 macros

adding deployment configuration; move packaging ZIP file to MSBuild (separate build file with additional targets)

VECTO-424 exchanged AssemblyName.GetAssemblyName by Assembly.Load with directory of executing assembly.