Cross compiling improvements + macOS universal binary (#1458)

* chore(resources): rename macos_arm64.txt to macos-arm64.txt
   This matches the platform-arch convention like many other parts of the project.
* chore(resources/cross): rename wasm.txt to unknown-wasm32.txt
* refactor(scripts/common.sh): use parameter expansion instead of if else
* feat(scripts/common.sh): support custom arch and platform for get_default_build_dir
* feat(scripts/build.sh): add --cross-platform, --cross-arch and --cross-file
* feat(scripts/package.sh): add --cross-platform and --cross-arch
* feat(build-packages.sh): add support for new options in build.sh and packages.sh
* ci(build): make arm64 binaries in CI
* ci(build): do not install external libraries
* ci(build): fix invalid artifact name
* ci(build): fix INSTALL_NAME
* ci(build): change name for macos artifacts
* ci(build): add script to build universal dmgs from individual dmgs
* ci(build): build universal dmgs
* fix(make-universal-binaries): fix wrong path for hdiutil
* ci(build): rename macos action
* fix(make-universal-binaries.sh): fix wrong pathname for ditto
* ci(release): build macos universal binaries
* ci(release): remove useless variables
* ci(release): fix wrong dependency
* ci(build): fix old ubuntu version
   This version will be restored once I complete some container-specific fixes.
* ci(build): make build_macos_universal depend on release
* ci(build): fix wrong dmg dir
* style(ci): capitalize 'universal' for CI name
* fix(make-universal-binaries.sh): fix truncated dmg name when it contains dots
* ci: styling changes
* ci(release): install appdmg only

resources/cross/macos-arm64.txt

@@ -0,0 +1,27 @@
+# cross file for compiling on MacOS ARM (Apple Sillicon).
+# use this file by running meson setup --cross-file resources/cross/macos_arm64.txt <builddir>
+
+[host_machine]
+system = 'darwin'
+cpu_family = 'aarch64'
+cpu = 'arm64'
+endian = 'little'
+
+[binaries]
+c = ['clang']
+cpp = ['clang++']
+objc = ['clang']
+objcpp = ['clang++']
+ar = ['ar']
+strip = ['strip']
+pkgconfig = ['pkg-config']
+
+[built-in options]
+c_args = ['-arch', 'arm64']
+cpp_args = ['-stdlib=libc++', '-arch', 'arm64']
+objc_args = ['-arch', 'arm64']
+objcpp_args = ['-stdlib=libc++', '-arch', 'arm64']
+c_link_args = ['-arch', 'arm64']
+cpp_link_args = ['-arch', 'arm64']
+objc_link_args = ['-arch', 'arm64']
+objcpp_link_args = ['-arch', 'arm64']