Add push notifications support for Windows and Android.
app: 451630cb4fc7ac4db362055bec109908f66ee884
app: 1cb96723867fe9d6332b6f59b1729cf43f5f8148
app: b726a5d48b5037ec66b6bc3adf0d362475a7a670
app: de3ad6c4101765fdc6bf639d8d31e8294ad00aa5 Still not working
web: c589453a7b16fb23042f1536e58bdf411af89a55
web: b4f8785d6835167252332c01534f1e133deba597
app: 451630cb4fc7ac4db362055bec109908f66ee884
app: 1cb96723867fe9d6332b6f59b1729cf43f5f8148
app: b726a5d48b5037ec66b6bc3adf0d362475a7a670