Add tasks for all the new languages

Task/Call-a-function-in-a-shared-library/Nim/call-a-function-in-a-shared-library-1.nim

@@ -0,0 +1,5 @@
+proc openimage(s: cstring): cint {.importc, dynlib: "./fakeimglib.so".}
+
+echo openimage("foo")
+echo openimage("bar")
+echo openimage("baz")

Task/Call-a-function-in-a-shared-library/Nim/call-a-function-in-a-shared-library-2.nim

@@ -0,0 +1,8 @@
+#include <stdio.h>
+/* gcc -shared -nostartfiles fakeimglib.c -o fakeimglib.so */
+int openimage(const char *s)
+{
+  static int handle = 100;
+  fprintf(stderr, "opening %s\n", s);
+  return handle++;
+}

Task/Call-a-function-in-a-shared-library/Nim/call-a-function-in-a-shared-library-3.nim

@@ -0,0 +1,5 @@
+proc openimage(s: string): int {.importc, dynlib: "./libfakeimg.so".}
+
+echo openimage("foo")
+echo openimage("bar")
+echo openimage("baz")

Task/Call-a-function-in-a-shared-library/Nim/call-a-function-in-a-shared-library-4.nim

@@ -0,0 +1,7 @@
+# nim c --app:lib fakeimg.nim
+var handle = 100
+
+proc openimage*(s: string): int {.exportc, dynlib.} =
+  stderr.writeln "opening ", s
+  result = handle
+  inc(handle)