Debugger: Allow loading dumpers from a file directly

Instead of requiring the user to add the required python
code to load them manually let him specify a file directly.
This also makes the feature accessible to LLDB which needs
a slightly different syntax.

Task-number: QTCREATORBUG-12492
Change-Id: I12621b1cea2429476b0865bcbcb739a238dcf6af
Reviewed-by: Orgad Shaneh <orgads@gmail.com>

src/plugins/debugger/debuggeractions.h

@@ -110,6 +110,8 @@ enum DebuggerActionCode
     RegisterForPostMortem,
     AlwaysAdjustColumnWidths,
 
+    ExtraDumperFile,     // For loading a file. Recommended.
+    ExtraDumperCommands, // To modify an existing setup.
 
     // Cdb
     CdbAdditionalArguments,
@@ -126,7 +128,6 @@ enum DebuggerActionCode
     LoadGdbDumpers,
     AttemptQuickStart,
     GdbStartupCommands,
-    GdbCustomDumperCommands,
     GdbPostAttachCommands,
     GdbWatchdogTimeout,
     AutoEnrichParameters,