Removed UpdateNotifier, reverted the folder name to r25:

There does not seem to be significant changes in the file structure to justify breaking custom sound packs by renaming the fodler name to r26 -- Reverted to what it's used in 1.6.2
Removed UpdateNotifier class
Added cheap way to save the user key binding
Merge pull request #1 from Hurricaaane/1_6_4

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