Add tasks for all the new languages

Task/ABC-Problem/Harbour/abc-problem.harbour

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+PROCEDURE Main()
+
+   LOCAL cStr
+
+   FOR EACH cStr IN { "A", "BARK", "BooK", "TrEaT", "comMON", "sQuAd", "Confuse" }
+      ? PadL( cStr, 10 ), iif( Blockable( cStr ), "can", "cannot" ), "be spelled with blocks."
+   NEXT
+
+   RETURN
+
+STATIC FUNCTION Blockable( cStr )
+
+   LOCAL blocks := { ;
+      "BO", "XK", "DQ", "CP", "NA", "GT", "RE", "TG", "QD", "FS", ;
+      "JW", "HU", "VI", "AN", "OB", "ER", "FS", "LY", "PC", "ZM" }
+
+   LOCAL cFinal := ""
+   LOCAL i, j
+
+   cStr := Upper( cStr )
+
+   FOR i := 1 TO Len( cStr )
+      FOR EACH j IN blocks
+         IF SubStr( cStr, i, 1 ) $ j
+            cFinal += SubStr( cStr, i, 1 )
+            j := ""
+            EXIT
+         ENDIF
+      NEXT
+   NEXT
+
+   RETURN cFinal == cStr