set debian alternatives for x-terminal-emulator

• I am on the latest Hyper.app version

• I have searched the issues of this repo and believe that this is not a duplicate

• OS version and name: Ubuntu/xenial (affects all debian distributions)

• Hyper.app version: 1.4.7

• Link of a Gist with the contents of your .hyper.js: n/a

• Relevant information from devtools (CMD+ALT+I on Mac OS, CTRL+SHIFT+I elsewhere): n/a

• The issue is reproducible in vanilla Hyper.app: Is Vanilla

Issue

many terminals update debian alternatives for /etc/alternatives/x-terminal-emulator to point to themselves. Hyper should do this in its debian packaging, per https://debian-administration.org/article/91/Using_the_Debian_alternatives_system

This requires the package to run

update-alternatives --install /etc/alternatives/x-terminal-emulator hyper /opt/Hyper/hyper 100

This would allow users could run:

update-alternatives --set x-terminal-emulator /opt/Hyper/hyper

Start by locating Hyper's Debian packaging entry points and checking how package installation scripts are defined. Add the requested update-alternatives registration for x-terminal-emulator, then verify that installing the Debian package registers Hyper and that the alternative can be selected with the command shown in the issue.