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Fix when opening inventory with no block selected, arrow input scrolling hotbar instead

Wii/Gamecube: Fix not resetting viewport/scissor after doing splitscreen and then going in-game

Merge pull request #1499 from Extrems/gx-fixes

Fixes for the GameCube/Wii graphics backend

Tidy up data cache flush functions a bit, also possibly fix rare corruption with gamecube/wii screenshot taking