Interpreter demo

Commands can be interpreted and executed at run time.
bbcli waits for standard input and interprets as commands.

Refer to module ConsInterp (thanks to Alexander Shiryaev) and module PrivHello demo for details.

Hello demo

First demo 'hello' is able to run at command line.

• Added stub Host (based on previous work of BlackBox community).
• As well added support for compiling and building plain CP files (with help of ConvUtf8, forked from CpcUtf8Conv): StdPlainDoc serves as helper module dynamically registering UTF-8 converter.

The current work was based primarily on project BlackBox Freenix and its goal was simplification.