Split a new page X509_load_cert_file(3) with three functions

out of X509_LOOKUP_hash_dir(3) because both groups of functions
differ substantially in purpose and structure.

Rewrite the complete text of X509_load_cert_file(3) from scratch
for correctness and clarity.

This fixes several documentation errors:
1. The names of the constants were wrong, lacking the "X509_" prefix.
2. None of these functions support X509_FILETYPE_DEFAULT,
neither in OpenSSL nor in LibreSSL.
3. The memory cache does not contain X509_STORE objects;
instead, the X509_STORE object *is* the memory cache.

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