Package NeuralNote for macOS

Build the app, VST3 and AU in Release mode (LTO is on by default, -DLTO=ON).
- muscriptor.cpp does not support universal binaries, so a build contains only one architecture (the host's by default), and there is one installer per architecture. On Apple Silicon, build the Intel one in a second build directory with -DCMAKE_OSX_ARCHITECTURES=x86_64, and package it the same way.
Install Packages if you don't have it already.
Set up an Apple Developer certificate and load it into Keychain (for both the app and the installer).
Run the sign_and_package_neuralnote_macos.sh script to sign the 3 artifacts and package them into an installer (.pkg file).
- Run the script with the path to the release directory containing the Standalone, VST3 and AU directory (usually cmake-build-release/NeuralNote_artefacts/Release).
```
./sign_and_package_neuralnote_macos.sh cmake-build-release/NeuralNote_artefacts/Release
```
- The script will ask for the Apple ID and password (app specific) for the signing process.
- An optional second argument names the installer, e.g. NeuralNote_Installer_Mac_x64.pkg. The script refuses a name for the wrong architecture.
- The installer will be located in Installers/Mac/build, named NeuralNote_Installer_Mac_arm64.pkg or NeuralNote_Installer_Mac_x64.pkg unless named by the second argument.

Package NeuralNote for Windows

On Windows, NeuralNote is not code signed for now. To create the installer, the following steps are required:

The installer will be located in Installers/Windows/Output.