Havanna Add Stringsfile (QuickLook Plugin to preview .strings files)
activate `suite` artifacts

fixes #7382
DSL: add stanza `stage_only` (new `caskroom_only`)

`caskroom_only` was never documented.  Its original purpose was
obsoleted in #4865, and its use has been recently been reduced to
two Casks.

This PR
* continues the rationalization of naming by changing `caskroom_only`
  to `stage_only`. "stage" is the verb for "make a copy under the
  caskroom directory"
* documents `stage_only`
* adds tests for `stage_only`
* validates the argument to `stage_only`
* gives sensible output in `brew cask info` for `stage_only` Casks
* enforces that `stage_only` cannot coexist with any activatable
  artifacts

`caskroom_only` is still supported for backward compatibility,
but should be removed before 0.50.0.
Update Mou URLs

The homepage and download URLs for Mou.app have changed now that the project is under a
software studio called 25.io
Merge pull request #7365 from rolandwalker/add_stage_only

DSL: add stanza `stage_only` (new spelling of `caskroom_only`)
DSL: remove `manual_installer` from `caveats`

obsoleted by new form `installer :manual`.

Also remove missed obsolete documentation item.
DSL: remove support for `container_type`

obsoleted by new form `container :type`
Merge pull request #7427 from gabrielizaias/update-mou-urls

Update Mou URLs
Merge pull request #7426 from rolandwalker/activate_suite

activate `suite` artifacts
remove old-style header line from test Casks

This takes the form of a horrible hack: DSL version numbers may
end with "test", *eg* ":v1test". Such Casks are mapped to class
`TestCask` instead of class `Cask`.

The intention is that all of this logic will be removed when
Casks are migrated away from separate classes.

Tests driven by RSpec are still todo.
Add Entonnoir Latest

Closes #7424.
Merge pull request #7431 from vitorgalvao/fix-7424

Add Entonnoir Latest
Merge pull request #7422 from Ihavee/stringsfile

Add Stringsfile (QuickLook Plugin to preview .strings files)
add missing test coverage for `suite` artifact

refs: #7382
fixed gitx-rowanj binary for case-sensitive systems
changed gitx-rowanj to have vendor as prefix, instead of suffix
Upgrade LyX to 2.1.2.2
Merge pull request #7434 from crainiarc/lyx

Upgrade LyX to 2.1.2.2
Merge pull request #7433 from vitorgalvao/gitx-case

gitx-rowanj fix for name and case-sensitive systems
renamed gitx-l to laullon-gitx (with canonical name as tag)