SaveGame Manager GX r042

by dj_skual, Giantpune
Install/Extract saved game files. Based on Waninkoko's SaveGame Manager.

CHANGELOG r042
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-Now, the blocksize is always get from the nand (so the blocksize is now
working for device but if youhave already a save install on the wii).
-added a GetSubName fonction
-added the Subname in SaveManagePrompt

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