Patch stash to run with Pythonista 3.4 beta

`launch_stash.py` will work. But an ignore exception `No method found
for selector "setAutomaticallyAdjustsContentInsetForKeyboard:"` is
raised.

pip seams to fail to download files.

system/shcommon.py

@@ -17,9 +17,14 @@
 if IN_PYTHONISTA:
     import plistlib
 
-    _properties = plistlib.readPlist(os.path.join(os.path.dirname(sys.executable), 'Info.plist'))
-    PYTHONISTA_VERSION = _properties['CFBundleShortVersionString']
-    PYTHONISTA_VERSION_LONG = _properties['CFBundleVersion']
+    info_plist_path = os.path.join(os.path.dirname(sys.executable), 'Info.plist')
+    if hasattr(plistlib, 'readPlist'):
+        _properties = plistlib.readPlist(info_plist_path)
+    elif hasattr(plistlib, 'load'):
+        with open(info_plist_path, 'rb') as info_plist:
+            _properties = plistlib.load(info_plist)
+    else:
+        raise Exception('`plistlib` does not support reading a plist file.')
 
     if PYTHONISTA_VERSION < '3.0':
         python_capi = ctypes.pythonapi

system/shui/pythonista_ui.py

@@ -385,14 +385,14 @@ def _vk_tapped(self, sender):
 # noinspection PyAttributeOutsideInit,PyUnusedLocal,PyPep8Naming
 class ShTerminal(ShBaseTerminal):
     """
-    This is a wrapper class of the actual TextView that subclass the SUITextView.
+    This is a wrapper class of the actual TextView that subclass the UITextView.
     The wrapper is used to encapsulate the objc calls so that it behaves more like
     a regular ui.TextView.
     """
 
     def __init__(self, stash, parent, superview, width, height):
 
-        # Create the actual TextView by subclass SUITextView
+        # Create the actual TextView by subclass UITextView
         UIKeyCommand = ObjCClass('UIKeyCommand')
 
         def kcDispatcher_(_self, _cmd, _sender):
@@ -490,7 +490,7 @@ def keyCommands(_self, _cmd):
             ('UIKeyInputRightArrow', 0): parent.arrowRightAction,
         }
 
-        _ShTerminal = create_objc_class('_ShTerminal', ObjCClass('SUITextView'), [keyCommands, kcDispatcher_])
+        _ShTerminal = create_objc_class('_ShTerminal', ObjCClass('UITextView'), [keyCommands, kcDispatcher_])
 
         self.is_editing = False
 
@@ -894,7 +894,7 @@ def render(self, no_wait=False):
                 self.render_thread.cancel()
             self._render()
         else:  # delayed rendering
-            if self.render_thread is None or not self.render_thread.isAlive():
+            if self.render_thread is None or not self.render_thread.is_alive():
                 self.render_thread = sh_delay(self._render, self.RENDER_INTERVAL)
             # Do nothing if there is already a delayed rendering thread waiting