As Debug and Prod builds are not binary-compatible with each other,
we do not want to use the NDEBUG flag to determine whether to use
the thread-safety helper, as it will disallow Prod programs to be
built against Debug library, and vice versa.

https://lily.kazv.moe/kazv/libkazv/-/issues/17

https://lily.kazv.moe/kazv/libkazv/-/issues/17

As lager cursors are not thread-safe to use, we need to differentiate
between cursors in different threads. We also need to store a cursor
in Deps that is suitable to use in the event loop thread.

https://lily.kazv.moe/kazv/libkazv/-/issues/17

We should not iterate over the map as we modify it.

https://lily.kazv.moe/kazv/libkazv/-/issues/8

The newest cmake on Ubuntu focal 20.04.2 LTS is 3.16,
and it compiles normally with cmake 3.16.

Sometimes we want the syncing to stop but let all current jobs
continue to its end. For example, this will be useful when
the Promise handler is going to be destroyed.

Otherwise when we load the data and syncing is true, startSyncing()
will not work.

Use pkg_search_module instead of the incorrect pkg_check_modules
for cryptopp, as we are expected to find only one of the two names.
Also, require Boost.serialization correctly.

We did not have a method to extract the SdkModel from Client.
Now we make it possible to serialize it *to* a Boost.Serialization
archive.

Gentoo will specify lib64 as the lib dir, and thus we should
install the cmake modules into that directory, not hardcoded lib/cmake.

We can now convert between EncryptedFileDesc and EncryptedFile json objects.

https://lily.kazv.moe/kazv/libkazv/-/issues/12