Scheduled toot (#1004)

* Scheduled toot

* Hide scheduled toot button if version < 2.7.0

* Fix timeline reloading after toot

* Add edit icon to ComposeScheduleView

* Add button to reset scheduled toot

* Close bottom sheet and change button color after time a was selected

* Fix edit icon's size

* List of scheduled toots

* Fix instance version check

* Use MaterialDatePicker

* Set date and time consecutively

* Add licenses

app/src/main/java/com/keylesspalace/tusky/entity/NewStatus.kt

@@ -26,6 +26,7 @@ data class NewStatus(
         val visibility: String,
         val sensitive: Boolean,
         @SerializedName("media_ids") val mediaIds: List<String>?,
+        @SerializedName("scheduled_at") val scheduledAt: String?,
         val poll: NewPoll?
 )