refs #404 Use domain-based identifiers for plugins

* Changed all plugin identifier to org.swift-project.plugins.simulator.*
* Fixed a small bug that caused settings be parsed wrong

src/plugins/simulator/fs9/simulator_fs9.json

@@ -1,5 +1,5 @@
 {
-    "identifier" : "swift_generic_fs9",
+    "identifier" : "org.swift-project.plugins.simulator.fs9",
     "name" : "Microsoft Flight Simulator 2004",
     "simulator" : "fs9",
     "description" : "Microsoft Flight Simulator 2004"

src/plugins/simulator/fsx/simulator_fsx.json

@@ -1,5 +1,5 @@
 {
-    "identifier" : "swift_generic_fsx",
+    "identifier" : "org.swift-project.plugins.simulator.fsx",
     "name" : "Microsoft Flight Simulator X",
     "simulator" : "fsx",
     "description" : "Microsoft Flight Simulator X (2006)"

src/plugins/simulator/xplane/simulator_xplane.json

@@ -1,5 +1,5 @@
 {
-    "identifier" : "swift_generic_xplane",
+    "identifier" : "org.swift-project.plugins.simulator.xplane",
     "name" : "X-Plane",
     "simulator" : "xplane",
     "description" : "X-Plane support via the xbus plugin"