Variables!

Add global and local variables support via the var field:

- name: coyote
  title: A Title

# We can set it more than once if we want
- name: coyote
  # These are global vars
  vars:
    PROG: echo

- name: Test
  # These are local vars
  vars:
    ARG1: hello
    ARG2: world
  entries:
    - name: Test 1
      # yaml needs quotes if you start the entry with %
      command: "%PROG% %ARG1% %ARG2%"