Dynamic engine options in UI for blender / ffmpeg (#66)

* Make sure progress UI updates occur on main thread

* Cleanup unnecessary code in FFMPEG

* Cleanup extension matching

* Make sure supported_extensions is now called as a method everywhere

* Fix add_job crashing

* Update the renderer to reflect the current file type

* Sort engine versions from newest to oldest

* Consolidate Project Group and Server Group

* Split UI options into its own file for easier updating

* Add ffmpeg ui stem

src/engines/blender/blender_engine.py

@@ -10,7 +10,6 @@ logger = logging.getLogger()
 class Blender(BaseRenderEngine):
 
     install_paths = ['/Applications/Blender.app/Contents/MacOS/Blender']
-    supported_extensions = ['.blend']
     binary_names = {'linux': 'blender', 'windows': 'blender.exe', 'macos': 'Blender'}
 
     @staticmethod
@@ -23,6 +22,14 @@ class Blender(BaseRenderEngine):
         from src.engines.blender.blender_worker import BlenderRenderWorker
         return BlenderRenderWorker
 
+    def ui_options(self):
+        from src.engines.blender.blender_ui import BlenderUI
+        return BlenderUI.get_options(self)
+
+    @staticmethod
+    def supported_extensions():
+        return ['blend']
+
     def version(self):
         version = None
         try:
@@ -150,13 +157,6 @@ class Blender(BaseRenderEngine):
         render_engines = [x.strip() for x in engine_output.split('Blender Engine Listing:')[-1].strip().splitlines()]
         return render_engines
 
-    # UI and setup
-    def get_options(self):
-        options = [
-            {'name': 'engine', 'options': self.supported_render_engines()},
-        ]
-        return options
-
     def perform_presubmission_tasks(self, project_path):
         packed_path = self.pack_project_file(project_path, timeout=30)
         return packed_path