Overhaul distribution profile

The installation in the docs currently expects to go and copy lots of jars to the /lib dir and since the (single) package we ship contains all different tomcat support jars, users are expected to delete the ones they are not using. We should align this to be easier and include a readme file in the directory.

Goals:

• create a distribution archive per tomcat version
• create separate demo distribution
• create assembly component to be shared across tomcat assemblies
• allow building for a specific tomcat version
• above including building -PTC9 which rebuilds tomcat85 sources with tomcat9 jars
• include jars in the lib/ folder and standard text files for licence and installation procedure
• provide executable demo scripts
• support files viewable and usable on windows