Update Build123dPortableSetup.nsi to v1.3

Added more extensions and much more optionality
A readme/weblink to this github page which explains how to avoid the OCP startup bug
Stayed so far on the install drive c: --> Appdata is the clean solution but it is so deep in the directory structure that nobody will find it and not everybody will set a desktop link. Windows programm folder is not advised...
Added personal preferences for workspace, a desktop link etc ...
Code Snippets is not implemented yet

Next release will include more programs to install like git and fossil. Some more cleanup and input from more testers.