Migrate ControllerEngine to QJSEngine + improve error handling

.travis.yml

@@ -43,6 +43,7 @@ addons:
       - portaudio19-dev
       - protobuf-compiler
       - qt5-default
+      - qtdeclarative5-dev
       - qtscript5-dev
       - scons
       - vamp-plugin-sdk

build/depends.py

@@ -213,6 +213,7 @@ def enabled_modules(build):
             'QtGui',
             'QtNetwork',
             'QtOpenGL',
+            'QtQml', # Needed for QJSEngine
             'QtScript',
             'QtScriptTools',
             'QtSql',
@@ -595,14 +596,6 @@ def sources(self, build):
                 env['CCFLAGS'].remove('-ffast-math')
         return env.Object('src/util/fpclassify.cpp')
 
-class QtScriptByteArray(Dependence):
-    def configure(self, build, conf):
-        build.env.Append(CPPPATH='#lib/qtscript-bytearray')
-
-    def sources(self, build):
-        return ['lib/qtscript-bytearray/bytearrayclass.cpp',
-                'lib/qtscript-bytearray/bytearrayprototype.cpp']
-
 class PortAudioRingBuffer(Dependence):
     def configure(self, build, conf):
         build.env.Append(CPPPATH='#lib/portaudio')
@@ -779,7 +772,6 @@ def sources(self, build):
 
                    "src/controllers/controller.cpp",
                    "src/controllers/controllerdebug.cpp",
-                   "src/controllers/controllerengine.cpp",
                    "src/controllers/controllerenumerator.cpp",
                    "src/controllers/controllerlearningeventfilter.cpp",
                    "src/controllers/controllermanager.cpp",
@@ -796,6 +788,8 @@ def sources(self, build):
                    "src/controllers/delegates/midibytedelegate.cpp",
                    "src/controllers/delegates/midioptionsdelegate.cpp",
                    "src/controllers/learningutils.cpp",
+                   "src/controllers/engine/controllerengine.cpp",
+                   "src/controllers/engine/controllerenginejsproxy.cpp",
                    "src/controllers/midi/midimessage.cpp",
                    "src/controllers/midi/midiutils.cpp",
                    "src/controllers/midi/midicontroller.cpp",
@@ -1435,7 +1429,7 @@ def depends(self, build):
         return [SoundTouch, ReplayGain, Ebur128Mit, PortAudio, PortMIDI, Qt, TestHeaders,
                 FidLib, SndFile, FLAC, OggVorbis, OpenGL, TagLib, ProtoBuf,
                 Chromaprint, RubberBand, SecurityFramework, CoreServices, IOKit,
-                QtScriptByteArray, Reverb, FpClassify, PortAudioRingBuffer, LAME]
+                Reverb, FpClassify, PortAudioRingBuffer, LAME]
 
     def post_dependency_check_configure(self, build, conf):
         """Sets up additional things in the Environment that must happen