adding a run-time debugger to BlackBox. Refs: #187.
Technically based on a prototype by ominc, which has been ported to BB1.7 by oberoncore, X512, Ivan, etc.
Plus:
- improved user interface: debugger is attached to running BB, no flickering, tool dialog, etc.
- debugger uses its own registry settings and saves core window layout
- internationalized
- relevant DevDebug changes since BB1.6 applied to RTDebug
- debugger works also under wine and latest Windows 10 update
- docu added.

Also fixes an error in DevDebug.ShowArray, where the type of variable vi has been changed from SHORTINT to INTEGER in issue-#19.
This variable is used for reading 2-byte characters and must be reset to SHORTINT.

Signed-off-by: Josef Templ <josef.templ@gmail.com>