Refactor OptionsFrame.py

Rename all <Name>Panel to <Name>Tab
e.g. AudioPanel -> AudioTab

Now every Tab inherits from TabPanel class

TabPanel class contains all the methods to
create widgets, disable them, set the sizers etc

Moved almost all magic literals
(strings, numbers, etc) to class level

OtherTab:
	Renamed to CMDTab

OutputTab:
	Change output format pick from
	checkbox to radiobutton

youtube_dl_gui/MainFrame.py

@@ -81,11 +81,11 @@ class MainFrame(wx.Frame):
         self.log_manager = log_manager
         self.download_manager = None
         self.update_thread = None
-        app_icon = get_icon_path()
+        self.app_icon = get_icon_path()
         
-        # Set app icon
-        if app_icon is not None:
-            self.SetIcon(wx.Icon(app_icon, wx.BITMAP_TYPE_PNG))
+        if self.app_icon is not None:
+            self.app_icon = wx.Icon(self.app_icon, wx.BITMAP_TYPE_PNG)
+            self.SetIcon(self.app_icon)
         
         # Create components
         self._panel = wx.Panel(self)
@@ -311,11 +311,7 @@ class MainFrame(wx.Frame):
 
     def _on_options(self, event):
         ''' Event handler method for self._options_btn. '''
-        options_frame = OptionsFrame(
-            self.opt_manager,
-            parent=self,
-            logger=self.log_manager
-        )
+        options_frame = OptionsFrame(self)
         options_frame.Show()
 
     def _on_close(self, event):