Add tasks for all the new languages

Task/File-modification-time/FreeBASIC/file-modification-time.freebasic

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+' FB 1.05.0 Win64
+
+' This example is taken directly from the FB documentation (see [http://www.freebasic.net/wiki/wikka.php?wakka=KeyPgFiledatetime])
+
+#include "vbcompat.bi"  '' to use Format function
+
+Dim filename As String, d As Double
+
+Print "Enter a filename: "
+Line Input filename
+
+If FileExists(filename) Then
+  Print "File last modified: ";
+  d = FileDateTime( filename )
+  Print Format( d, "yyyy-mm-dd hh:mm AM/PM" )
+Else
+  Print "File not found"
+End If
+
+Sleep

Task/File-modification-time/Lasso/file-modification-time.lasso

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+local(f) = file('input.txt')
+handle => { #f->close }
+#f->modificationDate->format('%-D %r')
+// result: 12/2/2010 11:04:15 PM

Task/File-modification-time/Nim/file-modification-time.nim

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+import os, times
+let accTime = getLastAccessTime("filename")
+let modTime = getLastModificationTime("filename")
+
+import posix
+var unixAccTime = Timeval(tv_sec: int(accTime))
+var unixModTime = Timeval(tv_sec: int(modTime))
+
+# Set the modification time
+unixModTime.tv_sec = 0
+
+var times = [unixAccTime, unixModTime]
+discard utimes("filename", addr(times))
+
+# Set the access and modification times to the current time
+discard utimes("filename", nil)

Task/File-modification-time/Oforth/file-modification-time.oforth

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+File new("myfile.txt") modified

Task/File-modification-time/Sidef/file-modification-time.sidef

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+var file = File.new(__FILE__);
+say file.stat.mtime;            # seconds since the epoch
+
+# keep atime unchanged
+# set mtime to current time
+file.utime(file.stat.atime, Time.now);

Task/File-modification-time/Ursa/file-modification-time.ursa

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+decl java.util.Date d
+decl file f
+
+f.open "example.txt"
+d.setTime (f.lastmodified)
+out d endl console
+
+f.setlastmodified 10