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_Font.cpp

@@ -92,7 +92,7 @@ int w_newTrueTypeRasterizer(lua_State *L)
 
 		if (luax_istype(L, 1, love::Data::type))
 		{
-			d = luax_checkdata(L, 1);
+			d = data::luax_checkdata(L, 1);
 			d->retain();
 		}
 		else