New Julia Launcher App

This builds the Julia framework and a launcher app and packages them in a product archive for the macOS Installer.

Run make APPLE_DEVELOPMENT_TEAM=xxxxxxxxxx to build the product archive. The resulting archive may be installed to the home directory with installer -pkg~/Documents/pkgs/Julia-1.1.0.pkg -target CurrentUserHomeDirectory. To just build the app, build the appexport make target. Read the comments at the top of the Makefile to set appropriate code signing parameters.

The framework is installed in /Library/Frameworks and the app in /Applications. Installation may be system-wide (i.e., relative to /) or local to the user's home directory (i.e., $Home/Applications/Julia.app).

The julia binary is embedded in the framework at Julia.framework/Helpers/julia.

Multiple versions of Julia may be installed at once. Each version is placed in the Julia.framework/Versions directory. By default, the version is identified by the Major.Minor version number but may be customized by setting the FRAMEWORK_VERSION make variable. The resulting product archive will not overwrite other versions but will upgrade a version if it exists. Thus, the 1.1 framework version that is actually the 3rd patch (1.1.3) will overwrite any existing 1.1 framework version.