detect shell and make it configurable

src/fenrirscreenreader/core/fenrirManager.py

@@ -41,6 +41,7 @@ class fenrirManager():
         parser.add_argument('-d', '--debug',  action='store_true', help='Turns on Debugmode') 
         parser.add_argument('-p', '--print',  action='store_true', help='Print debug messages on screen')                                         
         parser.add_argument('-e', '--emulation',  action='store_true', help='Use PTY emulation')                                                 
+        parser.add_argument('-f', '--femulation', metavar='SHELL', default='', help='Use PTY emulation')        
         try:
             args = parser.parse_args()
         except Exception as e:

src/fenrirscreenreader/core/settingsData.py

@@ -74,6 +74,7 @@ settingsData = {
   'commandPath': '/usr/share/fenrir/commands',
   'attributeFormatString': 'Background fenrirBGColor,Foreground fenrirFGColor,fenrirUnderline,fenrirBold,fenrirBlink, Font fenrirFont,Fontsize fenrirFontSize',
   'autoPresentIndent': False,
+  'shell': '',
 },
 'focus':{
   'cursor': True,