Restructured terminal APIs.

src/main/java/net/rubygrapefruit/platform/Terminal.java

@@ -1,9 +1,5 @@
 package net.rubygrapefruit.platform;
 
-public interface Terminal extends NativeIntegration {
-    enum Output {Stdout, Stderr}
-
-    boolean isTerminal(Output output);
-
-    TerminalSize getTerminalSize(Output output);
+public interface Terminal {
+    TerminalSize getTerminalSize();
 }