To reduce residual fragments of secret data in memory after
deallocation, this patch replaces the global delete operator with a
version that zeros out previously allocated memory. It makes use of
the new C++14 sized deallocation, but provides an unsized fallback
with platform-specific size deductions.
This change is only a minor mitigation and cannot protect against
buffer reallocations by the operating system or non-C++ libraries.
Thus, we still cannot guarantee all memory to be wiped after free.
As a further improvement, this patch uses libgcrypt and libsodium
to write long-lived master key component hashes into a secure
memory area and wipe it afterwards.
The patch also fixes compiler flags not being set properly on macOS.
* Fixes including keepassxc-cli when building KeePassXC dmg on Mac.
resolves#1697
* Fix Qt search path and Properties display on macOS
* Simplify packaging POST_BUILD fixups
* Various fixes to get cli to run on macos
* Correct cli tests on macOS
* Several macOS related GUI test fixes
