Merge device_verification from Chethan2k1/mtxclient

* Fix build Issue in the crypto_bot.cpp

* Add Linting

* Change the location of DeviceEventVistor

* Fix to_device test

* Remove iostream header

* Fix Remaining Tests

* Remove Sender and Type in KeyRequest

* Add endpoint to construct to_device messages

* Add new endpoint new_send_to_device

* Made Changes in new to_device_send

* Wait for carl's access_token

Add reaction JSON models

Rename RelatesTo for reply messages

Fixes Fluffychat messages containing null as the image dimensions
Fixes Facebookbridge not sending body, even though it is required, for
stickers
Fixes https://github.com/Nheko-Reborn/nheko/issues/166

Fix missing urlencoding for room_id in typing requests.

prev_batch and limited fields are not required; defaults added.

Qt < 5.9 moc chokes on that

Partial update of models.  Tests are still broken and there are some other issues that need to be resolved.  Getting this uploaded so that @Chethan can take a look at what's changed and modify their proposal

Do not create thumbnail info if there is no thumbnail

Merge 0.3.0 dev branch to master