ListBox appearance fixed at the borders:
a) bottom: it it placed over the current line (not under)
b) right side: listbox's right side is adjusted to the window's right side
Coed fixes:
CodeCompleteOptions now intializes itself from the configuration file BasicIDE.xcs
Added a checkbox for enabling extended types in the options dialog.
Cursor is visible when the listbox is active.
Fixed the small issue when deleting a character.

Change-Id: I68b80143de245cebfce65cdd8af37ea4694aa81b