Add tasks for all the new languages

Task/Pointers-and-references/EchoLisp/pointers-and-references.echolisp

@@ -0,0 +1,13 @@
+(define B (box 42))
+    → B ;; box reference
+(unbox B)
+    → 42 ;; box contents
+
+;; sets new value for box contents
+(define ( change-by-ref abox avalue)
+    (set-box! abox avalue) )
+
+(change-by-ref B 666)
+    → #[box 666]
+(unbox B)
+    → 666

Task/Pointers-and-references/FreeBASIC/pointers-and-references.freebasic

@@ -0,0 +1,47 @@
+' FB 1.05.0 Win64
+
+Type Cat
+  name As String
+  age As Integer
+End Type
+
+Type CatInfoType As Sub (As Cat Ptr)
+
+Sub printCatInfo(c As Cat Ptr)
+  Print "Name "; c->name, "Age"; c-> age
+  Print
+End Sub
+
+' create Cat object on heap and store a pointer to it
+Dim c As Cat Ptr = New Cat
+
+' set fields using the pointer and the "crow's foot" operator
+c->name = "Fluffy"
+c->age = 9
+
+' print them out through a procedure pointer
+Dim cit As CatInfoType = ProcPtr(printCatInfo)
+cit(c)
+
+Delete c
+c = 0
+
+Dim i As Integer = 3
+' create an integer pointer variable and set it to the address of 'i'
+Dim pi As Integer Ptr = @i
+
+'change the variable through the pointer
+*pi = 4
+
+'print out the result
+print "i ="; *pi
+
+'create a reference to the variable i
+Dim ByRef As Integer j = i
+
+' set j (and hence i) to a new value
+j = 5
+
+' print them out
+Print "i ="; i, "j ="; j
+Sleep

Task/Pointers-and-references/Nim/pointers-and-references-1.nim

@@ -0,0 +1,5 @@
+type Foo = ref object
+  x, y: float
+
+var f: Foo
+new f

Task/Pointers-and-references/Nim/pointers-and-references-2.nim

@@ -0,0 +1 @@
+echo f[]

Task/Pointers-and-references/Nim/pointers-and-references-3.nim

@@ -0,0 +1,4 @@
+echo f[].x
+f[].y = 12
+echo f.y
+f.x = 13.5

Task/Pointers-and-references/Nim/pointers-and-references-4.nim

@@ -0,0 +1,2 @@
+var x = 3
+var p = addr x

Task/Pointers-and-references/Nim/pointers-and-references-5.nim

@@ -0,0 +1,2 @@
+echo p[]
+p[] = 42

Task/Pointers-and-references/Nim/pointers-and-references-6.nim

@@ -0,0 +1,2 @@
+var y = 12
+p = addr y

Task/Pointers-and-references/Nim/pointers-and-references-7.nim

@@ -0,0 +1 @@
+p = nil

Task/Pointers-and-references/Sidef/pointers-and-references.sidef

@@ -0,0 +1,7 @@
+func assign2ref(ref, value) {
+    *ref = value;
+}
+
+var x = 10;
+assign2ref(\x, 20);
+say x;      # x is now 20