PluginSpec: Naming and encapsulation improvements

Prefer enabled state as a property as opposed to disabled state, and
make setter correspond to getter. Also move setters into private.

Change-Id: I5d002a12f4e540d5b38cc5865490d056ec75f296
Reviewed-by: Daniel Teske <daniel.teske@theqtcompany.com>

src/libs/extensionsystem/pluginspec_p.h

@@ -66,6 +66,11 @@ public:
     IPlugin::ShutdownFlag stop();
     void kill();
 
+    void setEnabledBySettings(bool value);
+    void setEnabledByDefault(bool value);
+    void setForceEnabled(bool value);
+    void setForceDisabled(bool value);
+
     QPluginLoader loader;
 
     QString name;
@@ -73,7 +78,7 @@ public:
     QString compatVersion;
     bool required;
     bool experimental;
-    bool disabledByDefault;
+    bool enabledByDefault;
     QString vendor;
     QString copyright;
     QString license;
@@ -82,7 +87,7 @@ public:
     QString category;
     QRegExp platformSpecification;
     QVector<PluginDependency> dependencies;
-    bool enabledInSettings;
+    bool enabledBySettings;
     bool disabledIndirectly;
     bool forceEnabled;
     bool forceDisabled;