Better defaults, less verbosity

Better defaults, less verbosity:

• Default focus behavior: (Argument: Normally being first means top priority)
  • Focus the first window
  • Focus the first pane in every window
• Change suppress_history default to false (Argument: More common to re-use a command after CTRL+C for example, suppress should be the exception)
• Allow name instead (or as-well) as window_name (Argument: We're already in the windows collection)
• Allow shell instead (or as-well) as shell_command (Argument: Verbose, two words)

BEFORE                                                                │ AFTER
---                                                                   │ ---
                                                                      │
session_name: acme                                                    │   session_name: acme
start_directory: ./                                                   │   start_directory: ./
suppress_history: false                                               │   windows:
windows:                                                              │     - name: edit
  - window_name: edit                                                 │       panes:
    focus: true                                                       │         - nvim -S ~/.cache/vim/session/acme-react-native.vim
    panes:                                                            │     - name: git
      - nvim -S ~/.cache/vim/session/acme-react-native.vim            │       panes:
  - window_name: git                                                  │         - shell:
    panes:                                                            │           - git status -sb
      - shell_command:                                                │           - git log --graph --all --oneline --decorate
        - git status -sb                                              │     - name: android
        - git log --graph --all --oneline --decorate                  │       layout: main-vertical
  - window_name: android                                              │       panes:
    layout: main-vertical                                             │         - shell:
    panes:                                                            │           - sleep 2
      - focus: true                                                   │           - react-native run-android
        shell_command:                                                │         - shell:
        - sleep 2                                                     │           - sleep 2
        - react-native run-android                                    │           - adb logcat
      - shell_command:                                          ---------→      - react-native start
        - sleep 2                                                     │     - name: db
        - adb logcat                                                  │       layout: main-vertical
      - react-native start                                            │       panes:
  - window_name: db                                                   │         - shell:
    layout: main-vertical                                             │           - sleep 4
    panes:                                                            │           - pgcli -h localhost -U acme acme
      - focus: true                                                   │           - SET search_path = public;
        shell_command:                                                │           - \dn; \dt public.*
        - sleep 4                                                     │         - shell:
        - pgcli -h localhost -U acme acme                             │           - cd ../api
        - SET search_path = public;                                   │           - docker-compose up db redis
        - \dn; \dt public.*                                           │     - name: api
      - shell_command:                                                │       panes:
        - cd ../api                                                   │       - shell:
        - docker-compose up db redis                                  │         - cd ../api
  - window_name: api                                                  │         - sleep 4
    panes:                                                            │         - find . -name '*py' | entr -r docker-compose up api
    - focus: true                                                     │  
      shell_command:                                                  │  
      - cd ../api                                                     │  
      - sleep 4                                                       │  
      - find . -name '*py' | entr -r docker-compose up api            │  
                                                                      │  

The issue names configuration defaults and aliases but no files, tests, or entry points. Start by locating the configuration parsing and session-generation code for focus, suppress_history, window_name, and shell_command; done means the proposed defaults and shorter names work while the shown configuration remains representable.