Internal restructuring of CommandContext

- getJoinedStrings(n) will now return literally everything after the first space following the (n-1)th argument. Mixing flags in after that is undefined
- What was in args before is now a List named parsedArgs, which also no longer contains the command, which was split off into a separate field.
- get[Padded]Slice now operates on the unparsed args with flags and all, allowing whoever uses it (script commands) to obtain a more low-level input.
- Added a test for the exactness of getJoinedStrings and adjusted an existing test to the new old behaviour.

src/test/java/com/sk89q/minecraft/util/commands/CommandContextTest.java

@@ -54,7 +54,7 @@ public class CommandContextTest {
         String joinedArg = firstCommand.getJoinedStrings(0);
         assertEquals("herpderp", command);
         assertEquals("another thing", argOne);
-        assertEquals("another thing because something", joinedArg);
+        assertEquals("'another thing'  because something", joinedArg);
     }
 
     @Test
@@ -64,7 +64,7 @@ public class CommandContextTest {
         assertTrue(firstCommand.hasFlag('w'));
         assertEquals("testers", firstCommand.getFlag('o'));
         assertEquals("mani world", firstCommand.getFlag('w'));
-        assertNull(firstCommand.getFlag('u'));
+        assertFalse(firstCommand.hasFlag('u'));
     }
 
     @Test
@@ -103,7 +103,7 @@ public class CommandContextTest {
     }
 
     @Test
-    public void testflagsAnywhere() {
+    public void testFlagsAnywhere() {
         try {
             CommandContext context = new CommandContext("r hello -f");
             assertTrue(context.hasFlag('f'));
@@ -115,4 +115,20 @@ public class CommandContextTest {
             fail("Error creating CommandContext");
         }
     }
+
+    @Test
+    public void testExactJoinedStrings() {
+        try {
+            CommandContext context = new CommandContext("r -f \"hello world\"   foo   bar");
+            assertTrue(context.hasFlag('f'));
+            assertEquals("\"hello world\"   foo   bar", context.getJoinedStrings(0));
+            assertEquals("foo   bar", context.getJoinedStrings(1));
+
+            CommandContext context2 = new CommandContext("pm name \"hello world\"   foo   bar");
+            assertEquals("\"hello world\"   foo   bar", context2.getJoinedStrings(1));
+        } catch (CommandException e) {
+            e.printStackTrace();
+            fail("Error creating CommandContext");
+        }
+    }
 }