WiiUtils: Check hashes to determine if a title is installed and up-to-date

Nintendo's official title installation code and ES both only look at
content IDs but we should probably check for content hashes in addition
to checking for IDs for at least two reasons:

1. Some of the installed contents could be corrupted -- this cannot be
   easily detected without checking hashes.

2. Some mod distributors do not bother to update content IDs, which
   means that installing updates from the UI would not actually
   update the installed game. This is confusing for users.

To keep the existing semantic (for IOS especially), the new content
hash checks are opt-in for callers of GetStoredContentsFromTMD.

This commit changes WiiUtils's WAD installation logic to enable
the content hash checks.

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