Add tasks for all the new languages

Task/Unicode-strings/LFE/unicode-strings-1.lfe

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+> (set encoded (binary ("åäö ð" utf8)))
+#B(195 165 195 164 195 182 32 195 176)

Task/Unicode-strings/LFE/unicode-strings-2.lfe

@@ -0,0 +1,2 @@
+> (io:format "~tp~n" (list encoded))
+<<"åäö ð"/utf8>>

Task/Unicode-strings/LFE/unicode-strings-3.lfe

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+> (unicode:characters_to_list encoded 'utf8)
+"åäö ð"

Task/Unicode-strings/Lasso/unicode-strings.lasso

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+local(unicode = '♥♦♣♠')
+#unicode -> append('\u9830')
+#unicode
+'<br />'
+#unicode -> get (2)
+'<br />'
+#unicode -> get (4) -> integer

Task/Unicode-strings/Lingo/unicode-strings.lingo

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+put _system.getInstalledCharSets()
+-- ["big5", "cp1026", "cp866", "ebcdic-cp-us", "gb2312", "ibm437", "ibm737",
+"ibm775", "ibm850", "ibm852", "ibm857", "ibm861", "ibm869", "iso-8859-1",
+"iso-8859-15", "iso-8859-2", "iso-8859-4", "iso-8859-5", "iso-8859-7",
+"iso-8859-9", "johab", "koi8-r", "koi8-u", "ks_c_5601-1987", "macintosh",
+"shift_jis", "us-ascii", "utf-16", "utf-16be", "utf-7", "utf-8", "windows-1250",
+"windows-1251", "windows-1252", "windows-1253", "windows-1254", "windows-1255",
+"windows-1256", "windows-1257", "windows-1258", "windows-874",
+"x-ebcdic-greekmodern", "x-mac-ce", "x-mac-cyrillic", "x-mac-greek",
+"x-mac-icelandic", "x-mac-turkish"]

Task/Unicode-strings/Nim/unicode-strings.nim

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+let c = "abcdé"
+let Δ = 12
+let e = "$abcde¢£¤¥©ÇßçIJijŁłʒλπ•₠₡₢₣₤₥₦₧₨₩₪₫€₭₮₯₰₱₲₳₴₵₵←→⇒∙⌘☺☻ア字文𪚥"
+echo e

Task/Unicode-strings/Sidef/unicode-strings.sidef

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+# International class; name and street
+ class 国際( なまえ, Straße ) {
+
+    # Say who am I!
+    method 言え {
+        say "I am #{self.なまえ} from #{self.Straße}";
+    }
+}
+
+ # all the people of the world!
+ var 民族 = [
+              国際( "高田　Friederich", "台湾" ),
+              国際( "Smith Σωκράτης", "Cantù" ),
+              国際( "Stanisław Lec", "południow" ),
+            ];
+
+民族.each { |garçon|
+    garçon.言え;
+}