databases/cego,devel/lfcbase: 2.52.2 -> 2.52.4, 1.21.3 -> 1.21.6HEADmain

lfcbase:
- To support several keyboard layouts, changed some window control
  sequences from Cntrl-Key to ESC key
- Added virtual method hasData to Pager class. The method must be
  implemented to indicate, if an execution returns a result set. If
  no result set is returned, just a message box is shown and edit
  mode is left ). This seems to be useful for DML queries ( insert,
  udate, delete, create, drop, ...)
- In Pager class, added buffer scrolling in editor part. Preparation
  started for Pager command history management
- Added history feature to Pager class. Command history can be loaded
  and saved with readHistory and writeHistory methods.
  Navigation through command history in Edit mode with Cntrl-P and Cntrl-N

cego:
- Adaptions made for pager and pager history feature

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