debugger: The DebuggerEngine refactoring.

This replaces the (de facto) singleton engines and data handlers by classes
that are instantiated per run. The DebuggerRunControl will now create an
object of (a class derived from) DebuggerEngine that contains all the relevant
"dynamic" data.

DebuggerManager is no more. The "singleton" bits are merged into DebuggerPlugin,
whereas the data bits went to DebuggerEngine.

There is no formal notion of a "current" DebuggerEngine. However, as there's
only one DebuggerEngine at a time that has its data models connected to the
view, there's still some "de facto" notion of a "current" engine. Calling
SomeModel::setData(int role, QVariant data) with custom role is used as the
primary dispatch mechanism from the views to the "current" data models
(and the engine, as all data models know their engine).

src/plugins/debugger/registerhandler.cpp

@@ -29,7 +29,10 @@
 
 #include "registerhandler.h"
 
+#include "debuggeractions.h"
+#include "debuggeragents.h"
 #include "debuggerconstants.h"
+#include "debuggerengine.h"
 
 #include <utils/qtcassert.h>
 
@@ -49,8 +52,8 @@ using namespace Debugger::Constants;
 //
 //////////////////////////////////////////////////////////////////
 
-RegisterHandler::RegisterHandler(QObject *parent)
-    : QAbstractTableModel(parent)
+RegisterHandler::RegisterHandler(DebuggerEngine *engine)
+  : m_engine(engine)
 {
     setNumberBase(16);
 }
@@ -67,8 +70,19 @@ int RegisterHandler::columnCount(const QModelIndex &parent) const
 
 QVariant RegisterHandler::data(const QModelIndex &index, int role) const
 {
-    if (role == RegisterNumberBaseRole)
-        return m_base;
+    switch (role) {
+        case EngineStateRole:
+            return m_engine->state();
+
+        case EngineCapabilitiesRole:
+            return m_engine->debuggerCapabilities();
+
+        case EngineActionsEnabledRole:
+            return m_engine->debuggerActionsEnabled();
+
+        case RegisterNumberBaseRole:
+            return m_base;
+    }
 
     if (!index.isValid() || index.row() >= m_registers.size())
         return QVariant();
@@ -136,6 +150,26 @@ Qt::ItemFlags RegisterHandler::flags(const QModelIndex &idx) const
     return  notEditable;
 }
 
+bool RegisterHandler::setData(const QModelIndex &index, const QVariant &value, int role)
+{
+    switch (role) {
+        case RequestSetRegisterRole:
+            m_engine->setRegisterValue(index.row(), value.toString());
+            return true;
+
+        case RequestReloadRegistersRole:
+            m_engine->reloadRegisters();
+            return true;
+
+        case RequestShowMemoryRole:
+            (void) new MemoryViewAgent(m_engine, value.toString());
+            return true;
+
+        default:
+            return QAbstractTableModel::setData(index, value, role);
+    }
+}
+
 void RegisterHandler::removeAll()
 {
     m_registers.clear();