Drafts and scheduled posts (#217)

closes #100
closes #59

* enable saving as draft (scheduled)
* add scheduled posts list
* fix NoSuchMethodError
* editable drafts/scheduled posts
* ui for drafts
* use instants between 9999-01-01 and 9999-12-31
* use save and draft strings
* map scheduled status params to status
* implement scheduling posts
* improve save/discard draft dialog
* persist scheduled date in state
* add unsent posts button to toolbar
* clean up imports

mastodon/src/main/java/org/joinmastodon/android/model/Account.java

@@ -164,6 +164,10 @@ public class Account extends BaseModel{
 		return '@'+acct;
 	}
 
+	public String getShortUsername() {
+		return '@'+acct.split("@")[0];
+	}
+
 	@Override
 	public String toString(){
 		return "Account{"+

mastodon/src/main/java/org/joinmastodon/android/model/FilterResult.java

@@ -0,0 +1,8 @@
+package org.joinmastodon.android.model;
+
+import org.parceler.Parcel;
+
+@Parcel
+public class FilterResult extends BaseModel {
+    public Filter filter;
+}

mastodon/src/main/java/org/joinmastodon/android/model/Status.java

@@ -20,7 +20,7 @@ public class Status extends BaseModel implements DisplayItemsParent{
 	public Instant createdAt;
 	@RequiredField
 	public Account account;
-//	@RequiredField
+	//	@RequiredField
 	public String content;
 	@RequiredField
 	public StatusPrivacy visibility;
@@ -40,7 +40,7 @@ public class Status extends BaseModel implements DisplayItemsParent{
 	public long favouritesCount;
 	public long repliesCount;
 	public Instant editedAt;
-	public boolean wantsTranslation;
+	public List<FilterResult> filtered;
 
 	public String url;
 	public String inReplyToId;
@@ -50,7 +50,6 @@ public class Status extends BaseModel implements DisplayItemsParent{
 	public Card card;
 	public String language;
 	public String text;
-	public String translation;
 
 	public boolean favourited;
 	public boolean reblogged;