[cdt-patch] Changes to cdt.mi.core

["Alain Magloire" <alain@xxxxxxx>]

Registers are now using the gdb/mi methods:

-data-list-changed-registers
-data-list-register-names
-data-list-register-values

instead of creating variable-objects, the debugger
is now more stable.

Using variable objects for the registers for some reasons hang gdb,
unfortunately, there is no small tests case to reproduce this.

The patch was to big, to inline ... 8)