Update mcpe_viz.xml for mcpe1.10

[oshouki]

Updated mcpe_viz.xml with blocks and items added in mcpe 1.9 and 1.10. These include blocks of various slabs, walls, and stairs, as well as new items, Shield and Crossbow. Also updated the Scaffolding id as per official minecraft wiki.

Note: New Stairs added do not include the blockvariant information found for existing stairs entries.

(All changes can be found by searching for "oshouki".)