Add tasks for all the new languages

Task/Natural-sorting/Sidef/natural-sorting-1.sidef

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+class String {
+    # Sort groups of digits in number order. Sort by order of magnitude then lexically.
+    -> naturally { self.lc.gsub(/(\d+)/, {|s1| "0" + s1.len.chr + s1 }) + "\x0" + self };
+
+    # Collapse multiple ws characters to a single.
+    -> collapse { self.gsub(/(\s)\1+/, {|s1| s1 }) };
+
+    # Convert all ws characters to a space.
+    -> normalize { self.gsub(/(\s)/, ' ') };
+
+    # Ignore common leading articles for title sorts
+    -> title { self.sub(/^(?:a|an|the)\b\s*/i, '') };
+
+    # Decompose ISO-Latin1 glyphs to their base character.
+    -> latin1_decompose {
+        static tr = Hash.new(%w(
+           Æ AE æ ae Þ TH þ th Ð TH ð th ß ss À A Á A Â A Ã A Ä A Å A à a á a
+            â a ã a ä a å a Ç C ç c È E É E Ê E Ë E è e é e ê e ë e Ì I Í I Î
+            I Ï I ì i í i î i ï i Ò O Ó O Ô O Õ O Ö O Ø O ò o ó o ô o õ o ö o
+            ø o Ñ N ñ n Ù U Ú U Û U Ü U ù u ú u û u ü u Ý Y ÿ y ý y
+        )...);
+
+        var re = Regex.new('(' + tr.keys.join('|') + ')');
+        self.gsub(re, {|s1| tr{s1} });
+    }
+}

Task/Natural-sorting/Sidef/natural-sorting-2.sidef

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+var tests = [
+    [
+        "Task 1a\nSort while ignoring leading spaces.",
+        [
+          'ignore leading spaces: 1', '   ignore leading spaces: 4',
+          '  ignore leading spaces: 3', ' ignore leading spaces: 2'
+        ],
+        { .trim } # builtin method.
+    ],
+    [
+        "Task 1b\nSort while ignoring multiple adjacent spaces.",
+        [
+          'ignore m.a.s   spaces: 3', 'ignore m.a.s spaces: 1',
+          'ignore m.a.s    spaces: 4', 'ignore m.a.s  spaces: 2'
+        ],
+        { .collapse }
+    ],
+    [
+        "Task 2\nSort with all white space normalized to regular spaces.",
+        [
+          "Normalized\tspaces: 4", "Normalized\xa0spaces: 1",
+          "Normalized\x20spaces: 2", "Normalized\nspaces: 3"
+        ],
+        { .normalize }
+    ],
+    [
+        "Task 3\nSort case independently.",
+        [
+          'caSE INDEPENDENT: 3', 'casE INDEPENDENT: 2',
+          'cASE INDEPENDENT: 4', 'case INDEPENDENT: 1'
+        ],
+        { .lc } # builtin method
+    ],
+    [
+        "Task 4\nSort groups of digits in natural number order.",
+        %w(Foo100bar99baz0.txt foo100bar10baz0.txt foo1000bar99baz10.txt
+           foo1000bar99baz9.txt 201st 32nd 3rd 144th 17th 2 95),
+        { .naturally }
+    ],
+    [
+        "Task 5 ( mixed with 1, 2, 3 & 4 )\n"
+        + "Sort titles, normalize white space, collapse multiple spaces to\n"
+        + "single, trim leading white space, ignore common leading articles\n"
+        + 'and sort digit groups in natural order.',
+        [
+          'The Wind     in the Willows  8', '  The 39 Steps               3',
+          'The    7th Seal              1', 'Wanda                        6',
+          'A Fish Called Wanda          5', ' The Wind and the Lion       7',
+          'Any Which Way But Loose      4', '12 Monkeys                   2'
+        ],
+        { .normalize.collapse.trim.title.naturally }
+    ],
+    [
+        "Task 6, 7, 8\nMap letters in Latin1 that have accents or decompose to two\n"
+        + 'characters to their base characters for sorting.',
+        %w(apple Ball bald car Card above Æon æon aether
+            niño nina e-mail Évian evoke außen autumn),
+        { .latin1_decompose.naturally }
+    ]
+];
+
+tests.each { |case|
+    var code = case.pop;
+    var array = case.pop;
+    say case.pop+"\n";
+
+    say "Standard Sort:\n";
+    array.sort.each { .say };
+
+    say "\nNatural Sort:\n";
+    array.sort_by(code).each { .say };
+
+    say "\n#{'*' * 40}\n";
+}