Add tasks for all the new languages

Task/Binary-strings/Phix/binary-strings.phix

@@ -0,0 +1,24 @@
+string s = "abc"
+    s = x"ef bb bf" -- explicit binary string (the utf8 BOM)
+    s[2] = 0
+    s[3] = 'z'
+    if s="\#EF\0z" then puts(1,"ok\n") end if
+string t = s
+    t[1..2] = "xy"  -- s remains unaltered
+    ?t              -- "xyz"
+    t = "food"      ?t
+    t[2..3] = 'e'   ?t -- "feed"
+    t[3..2] = "ast" ?t -- "feasted"
+    t[3..-2] = ""   ?t -- "fed"
+    if length(t)=0 then puts(1,"t is empty\n") end if
+    if t!="" then puts(1,"t is not empty\n") end if
+    t = "be"
+    t &= 't'        ?t  -- bet
+    t = 'a'&t       ?t  -- abet
+    ?t[2..3]            -- be
+    ?substitute(t,"be","bbo")   -- abbot
+    ?substitute(t,"be","dep")   -- adept
+    t = substitute(t,"be","dep") -- to actually modify t
+    ?join({"abc","def","ghi"})  -- "abc def ghi"
+    ?join({"abc","def","ghi"},"")   -- "abcdefghi"
+    ?join({"abc","def","ghi"},"\n") -- "abc\ndef\nghi"