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Try to achieve consistency in reporting stop messages for all
engines. Report by BreakpointId if available.

get away from argument stringlists. instead, use native shell command
lines which support quoting/splitting, environment variable expansion
and redirections with well-understood semantics.

Task-number: QTCREATORBUG-542
Task-number: QTCREATORBUG-1564

To keep the breakpoint state machinery simple

Reviewed by:  hjk

The breakpoints are now (fairly) tightly guarded by the BreakpointHandler.
Engines and Views are only supposed to refer to them by id. They also have
individual states now. The breakpoint data is split into a "user requested"
"fixed" part in BreakpointData and the engines' acknowledged data in a new
struct BreakpointResponse.

TODO: Move m_state and m_engine members to BreakpointResponse. Fix regressions
in the marker handling.

There's  some 'external' and some 'internal' part now. Other plugins
are only supposed the external interface.

Remove actions from debugger plugin as they are not directly usable.
Create additional actions in context menu.

Move some code around to find the current editor.

Acked-By: dt

Reviewed-by: Friedemann Kleint
Reviewed-by: hjk

(cherry picked from commit 57f76162)

Task-number: QTCREATORBUG-2837
(cherry picked from commit 2efdeb5c)