Add tasks for all the new languages

Task/Substring/ECL/substring.ecl

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+/* In this task display a substring:
+
+1.       starting from n characters in and of m length;
+2.       starting from n characters in, up to the end of the string;
+3.       whole string minus last character;
+4.       starting from a known character within the string and of m length;
+5.       starting from a known substring within the string and of m length.
+*/
+
+IMPORT STD; //imports a standard string library	
+	
+TheString := 'abcdefghij';
+CharIn    := 3; //n
+StrLength := 4; //m
+KnownChar := 'f';
+KnownSub  := 'def'; 	
+FindKnownChar := STD.Str.Find(TheString, KnownChar,1);
+FindKnownSub  := STD.Str.Find(TheString, KnownSub,1);
+	
+OUTPUT(TheString[Charin..CharIn+StrLength-1]); //task1	
+OUTPUT(TheString[Charin..]);                   //task2
+OUTPUT(TheString[1..LENGTH(TheString)-1]);     //task3
+OUTPUT(TheString[FindKnownChar..FindKnownChar+StrLength-1]);//task4
+OUTPUT(TheString[FindKnownSub..FindKnownSub+StrLength-1]);  //task5	
+
+/* OUTPUTS:
+   defg
+   cdefghij	
+   abcdefghi
+   fghi
+   defg	
+*/