improvment for dsmviewer.debugMode

[romani]

It is done:
Add the debug mode JVM option is checked by plugin:
-Ddsmviewer.debugMode=[true|false] toggles Debug / Production mode (Production by default):

• Debug mode (if dsmviewer.debugMode=true) → runtime plugin logs to it`s own console and Eclipse native log shows all plugin logs for all levels.
• Production mode (if dsmviewer.debugMode=false) → runtime plugin doesnt log to its own console and Eclipse native log shows 'WARNING' and 'ERROR' logs only.

But, additionally to that we need to provide :

• convenient date pattern for logging
• reduce memory is needed for loggers (objects reusing, etc) and
• improve the logging performance.
  Minors: print DSMs as text to target platform console to perform the quick checks using single Eclipse instance without window switching.