Feature: package.install location

[Jerakin]

Description
I want to copy a file relative to a packaged install location.

This requires some design decisions as this variable needs to be kind of dynamic, it should probably probably refer to the last used package installers install location.

Additional information
I needed to put a policies.json next to the install location of my browser.
https://support.mozilla.org/en-US/kb/customizing-firefox-using-policiesjson

Manifest Example

actions:
  - action: package.install
    name: Zen-Team.Zen-Browser

  - action: file.copy
    from: files/zen/policies.json
    to: "{{ package.install_dir }}"/Zen-Browser

Current workaround
Figure out all install locations for each package on each OS and add an action for that.