recast method `destination_path` as `staged_path`

* part of DSL 1.0 review
* `destination_path` was always a bit vague (it refers to
  Cask-specific, version-specific location under
  `/opt/homebrew-cask/Caskroom`)
* here renamed `staged_path` to match upcoming command verb
  `brew cask stage`
* rename also intended to reduce confusion when we implement
  copying as a configurable alternative to symlinking
* transitional `destination_path` methods to remain while
  Casks are converted (this was documented as a part of the
  DSL, and used by 39 Casks in main repo)
* unrelated variables containing "stage" recast for clarity
reuse version in boom-recorder.rb
reuse version in fliquo.rb
reuse version in geneious.rb
reuse version in jabber-video.rb
reuse version in preform.rb
reuse version in sauerbraten.rb
reuse version in slender.rb
Update adobe-air sha256.
macaw 1.5.8
Update launchcontrol to 1.16.2
quickradar 15
Update Airserver to 5.0.7
update for backuploupe and launchcontrol
updated mamp to 3.0.7.1
Update xmarks for safari to 2.0.18
Merge pull request #6804 from exherb/xmarks-safari-2.0.18

Update xmarks for safari to 2.0.18
Merge pull request #6793 from exherb/launchcontrol-1.16.2

Update launchcontrol to 1.16.2
Merge pull request #6794 from exherb/quickradar-1.0b1

update quickradar to 1.0b1
Merge pull request #6792 from exherb/macaw-1.5.8

Update macaw to 1.5.8