* parameterize MAX_LENGTH_SZ using overrideable WOLFSSL_ASN_MAX_LENGTH_SZ, default value 5 (raised from 4).
* refactor other Misc_ASN constants to refer to MAX_LENGTH_SZ as appropriate.
* tweak BytePrecision() appropriately.
* refactor SetShortInt() to use BytePrecision() and include a length assert against MAX_SHORT_SZ to assure no buffer overruns with reduced WOLFSSL_ASN_MAX_LENGTH_SZ.
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