Add CreationFlags and simplify API of createKey and createSubkey
d3559c8abcfe
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Description

Add CreationFlags and simplify API of createKey and createSubkey

* src/context.h (enum Context::CreationFlags): New.
(Context::createKey, Context::startCreateKey, Context::createSubkey,
Context::startCreateSubkey): Add overload. Deprecate old overload.
(Context::createKeyEx): Deprecate.
(operator|, operator|=): New.
* src/context.cpp ((Context::createKey, Context::startCreateKey,
Context::createSubkey, Context::startCreateSubkey): Define new overload.
* tests/CMakeLists.txt: Add new test program.
* tests/run-createkey.cpp: New.

CreationFlags provides the useful GPGME_CREATE_* flags of gpgme. The
GPGME_CREATE_* flags that have no effect (because support for them has
never been implemented) were left out. The new overloads provide a
nicer C++ interface leaving out useless arguments (reserved, certKey).