* romfs: add hash bucket fields to RomFileSystemContext struct.
* romfs: remove current offset fields from RomFileSystemContext struct and all functions that relied on them.
* romfs: add romfsCalculateEntryHash().
* romfs: update romfsInitializeContext() to also load file/directory hash buckets.
* romfs: update romfsGetTotalDataSize() to make up for the removed functions.
* romfs: update romfsGetChild*EntryByName() functions to use hash bucket lookups.
Other changes include:
* devoptab: add missing exit macros to some FS operations across all interfaces.
* poc: update extractedRomFsReadThreadFunc() to make up for the removed RomFS functions.
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