debug feature added to Dialog. Refs: #80.
With the logXXX flags various inconsistencies in the usage of Strings resources can be logged.
Bug fixed in DevInspector when generating subsystem names for System.
#System:Deleting and #System:Inserting added as proposed in CPC 1.7rc6.
Redundant #Host:HostBitmaps.ExportBitmap removed.

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