revise accessibility methods in postflight miniDSL

* rename `remove_accessibility_access` to `disable_accessibility_access`
  to match corresponding method `enable_accessibility_access`
* move `TCC.db` and `.AccessibilityAPIEnabled` paths to `Cask::Locations`
* remove unneeded backslash from `TCC.db` path
* use full paths to `touch` and `sqlite3` utilities
* use `@command.run` instead of `system_command` which is intended as an
  external interface
* reverse conditional so enable/disable logic is consistent
* `sudo` is needed when creating `.AccessibilityAPIEnabled`
* instead of silent fail, warn that access cannot be safely disabled on
  Mountain Lion and earlier (it could, but might affect other apps)
* quoting/whitespace
revise plist methods in postflight mini-DSL

* accept index argument to `info_plist` in case of multiple `app`
  artifacts, defaulting to first
* return `Pathname` object from `info_plist`
* use `@command.run` instead of `system_command` which is intended
  as an external interface
* quoting
revise move_to_app method in postflight mini-DSL

* use `@command.run` instead of `system_command` which is intended
  as an external interface
* quoting
Fix maintenance links for 10.8-10
Add Yosemite and legacy downloads for deeper
Merge pull request #7727 from jawshooah/fix-maintenance-links

Fix Maintenance links for 10.8-10
Merge pull request #7728 from jawshooah/deeper-legacy-links

Add Yosemite and legacy urls for Deeper
Update td-agent version 2.1.1
Upgrade Sigil to v0.8.2
Update Framer Studio.app to version 1.9.39
Merge pull request #7729 from n0ts/td-agent

Update td-agent version 2.1.1
Merge pull request #7730 from Ihavee/sigil

Upgrade Sigil to v0.8.2
Merge pull request #7733 from vinkla/framer-studio

Update Framer Studio.app to version 1.9.39
Merge pull request #7686 from rolandwalker/move_to_app_postflight_review

review/revise `suppress_move_to_applications` method in postflight mini-DSL
Merge pull request #7685 from rolandwalker/plist_postflight_review

review/revise plist methods in postflight mini-DSL
Merge pull request #7684 from rolandwalker/accessibility_review

Review and revise accessibility methods in postflight mini-DSL
Fix download links for Onyx on Mountain Lion, Mavericks, and Yosemite; Add tests and links for Onyx under Tiger and Leopard