Merge branch 'nse-lua53'

Lua 5.3 adds several awesome features of particular interest to nmap including
bitwise operators and integers, a utf8 library, and standard binary pack/unpack
functions.

In addition to adding Lua 5.3, this branch changes:

o Complete removal of the NSE bit library (in C), It has been replaced with
  a new Lua library wrapping Lua 5.3's bit-wise operators.

o Complete removal of the NSE bin library (in C). It has been replaced with a
  new Lua library wrapping Lua 5.3's string.pack|unpack functions.

o The bin.pack "B" format specifier (which has never worked correctly) is
  unimplemented.  All scripts/libraries which use it have been updated. Most
  usage of this option was to allow string based bit-wise operations which are no
  longer necessary now that Lua 5.3 provides integers and bit-wise operators.

o The base32/base64 libraries have been reimplemented using Lua 5.3's new
  bitwise operators. (This library was the main user of the bin.pack "B" format
  specifier.)

o A new "bits" library has been added for common bit hacks. Currently only has
  a reverse function.

Thanks to David Fifield, Daniel Miller, Jacek Wielemborek, and  Paulino
Calderon for testing this branch.

liblua/liblua.vcxproj

@@ -122,6 +122,7 @@
     <ClCompile Include="ltablib.c" />
     <ClCompile Include="ltm.c" />
     <ClCompile Include="lundump.c" />
+    <ClCompile Include="lutf8lib.c" />
     <ClCompile Include="lvm.c" />
     <ClCompile Include="lzio.c" />
   </ItemGroup>
@@ -140,6 +141,7 @@
     <ClInclude Include="lobject.h" />
     <ClInclude Include="lopcodes.h" />
     <ClInclude Include="lparser.h" />
+    <ClInclude Include="lprefix.h" />
     <ClInclude Include="lstate.h" />
     <ClInclude Include="lstring.h" />
     <ClInclude Include="ltable.h" />