Add love.data module.

- Moved love.math.compress / decompress / decode / encode / hash to love.data.
- Changed love.data.compress/decompress to take the format argument first instead of second.
- Added love.data.newDataView. Returns a read-only subsection of an existing Data object.
- Added love.data.newByteData. Mostly useful in combination with LuaJIT's FFI as it has no extra methods currently.
- Added implementations of Lua 5.3's data packing APIs: love.data.packString / packData / unpack / getPackedSize.

Resolves issue #1336.
Resolves issue #1331.

--HG--
branch : minor

src/modules/font/wrap_GlyphData.cpp

@@ -141,7 +141,7 @@ const luaL_Reg w_GlyphData_functions[] =
 
 extern "C" int luaopen_glyphdata(lua_State *L)
 {
-	return luax_register_type(L, &GlyphData::type, w_Data_functions, w_GlyphData_functions, nullptr);
+	return luax_register_type(L, &GlyphData::type, data::w_Data_functions, w_GlyphData_functions, nullptr);
 }
 
 } // font