minor modes cleanup

app/src/main/java/io/github/sspanak/tt9/ime/modes/InputMode.java

@@ -84,7 +84,7 @@ abstract public class InputMode {
 
 	// Utility
 	abstract public int getId();
-	abstract public int getSequenceLength(); // The number of key presses for the current word.
+	public int getSequenceLength() { return digitSequence.length(); } // The number of key presses for the current word.
 	public int getAutoAcceptTimeout() {
 		return autoAcceptTimeout;
 	}

app/src/main/java/io/github/sspanak/tt9/ime/modes/ModeABC.java

@@ -83,7 +83,6 @@ public class ModeABC extends InputMode {
 		shouldSelectNextLetter = true; // do not accept any previous suggestions after loading the new ones
 	}
 
-	@Override public int getSequenceLength() { return 1; }
 	@Override public void onAcceptSuggestion(@NonNull String word) { reset(); }
 	@Override public boolean shouldAcceptPreviousSuggestion() { return !shouldSelectNextLetter; }
 	@Override public boolean shouldSelectNextSuggestion() { return shouldSelectNextLetter; }

app/src/main/java/io/github/sspanak/tt9/ime/modes/ModePredictive.java

@@ -421,8 +421,6 @@ public class ModePredictive extends InputMode {
 	}
 
 
-	@Override public int getSequenceLength() { return digitSequence.length(); }
-
 	@NonNull
 	@Override
 	public String toString() {

app/src/main/java/io/github/sspanak/tt9/ime/modes/helpers/Predictions.java

@@ -23,10 +23,6 @@ public class Predictions {
 	private ArrayList<String> words = new ArrayList<>();
 
 
-	public Predictions() {
-	}
-
-
 	public Predictions setLanguage(Language language) {
 		this.language = language;
 		return this;