Get Clipper to work in Android 10

Change the front program to Clipper, do the clipper.get and change back to PokemonGO.
Do some small waits in between.
The idea is base on some note from Tuan Chau @tuanchauict , he is mention in a issue note on Clipper (/majido/clipper/issues/9), "Seems like we need to open the app to the foreground to achieve it."

pokemonlib.py

@@ -104,7 +104,11 @@ async def read_logcat(self):
         return line
 
     async def get_clipboard(self):
+        return_code, stdout, stderr = await self.run(["adb", "-s", await self.get_device(), "shell", "am start -n ca.zgrs.clipper/.Main"])
+        await asyncio.sleep(0.3)
         await self.send_intent("clipper.get")
+        return_code, stdout, stderr = await self.run(["adb", "-s", await self.get_device(), "shell", "am start -n com.nianticlabs.pokemongo/com.nianticproject.holoholo.libholoholo.unity.UnityMainActivity"])
+        await asyncio.sleep(0.3)
         while True:
             line = await self.read_logcat()
             match = RE_CLIPBOARD_TEXT.match(line)