Add Argon2Kdf and enable parameters in db settings

Note: This implementation is not yet connected to the
database itself and will corrupt existing kdbx3 db's.

* Implemented memory and parallelism parameters for Argon2Kdf
* Using libargon2; libsodium does not support Argon2d algorithm
* Moved basic rounds parameter into Kdf class
* Reimplemented benchmark algorithm; previous was utterly broken

src/cli/CMakeLists.txt

@@ -46,6 +46,7 @@ target_link_libraries(keepassxc-cli
                       keepassx_core
                       Qt5::Core
                       ${GCRYPT_LIBRARIES}
+                      ${ARGON2_LIBRARIES}
                       ${GPGERROR_LIBRARIES}
                       ${ZLIB_LIBRARIES}
                       ${ZXCVBN_LIBRARIES})