Prepare the code base to enable exploitation of the vector instructions which were newly introduced with z13 a while ago.
This preparation task provides
 - definitions of the newly introduced vector registers
 - instruction definitions (vector support instructions and vector integer instructions only)
 - basic instruction emitters (vector support instructions and vector integer instructions only)
This preparation task does NOT provide
 - any support for vector string instructions
 - any support for vector float instructions
 - any exploitation code that will result in vector instructions being generated.