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Generate debug HUD text with ostringstream instead of snprintf.

This should fix #730.
Fix editbox default text being pre-selected in some cases
Fix minetest.get_inventory(loc) always returning nil for "node" type loc
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Fix some nullptr exceptions when handling invalid node inventories
Fix missing find_path and line_of_sight
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'