don't use qHash() for permanent data, use CRC32 instead (#326)
don't use qHash() for permanent data, use CRC32 instead (#326)

qHash() doesn't specify some algorithm, so it is not suitable for
permanent data as so as returned value may be changed depending on
Qt version (more correctly on used underlying algorithm)

CRC32 is very lightweight checksum algorithm, so it will not have
significant impact to performance (especially for such small data)

CRC32 implementation is available in Zlib, which is already used in
the project, so it costs nothing using CRC32 implementation from it
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