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Protect cache and code_cache directories when deleting account

akwizgran requested to merge 1371-protect-code-cache-directory into master

The package manager stores the inode numbers of the cache and code_cache directories so it can clear them later even if the filenames are encrypted due to the device being locked. If we delete those directories then the inode numbers can be reused. This can lead to the app_key directory being cleared when a new package is installed.

This branch preserves both directories, but clears the contents of the cache directory in case it contains sensitive information.

Closes #1371 (closed), #1545 (closed)

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