Add Quassel's standalone package v0.11.0

Also sets quassel-client's license.
add sourceforge URL special case for excalibur

fixes #7373
tighten sourceforge URL regular expressions
DSL: remove support for `depends_on_formula`

obsoleted by `depends_on :formula`
Upgrade EagleFiler.app to v1.6.3
updated makemkv ('1.9.0')
Merge pull request #7415 from vitorgalvao/update-makemkv

updated makemkv ('1.9.0')
Merge pull request #7414 from jconley/eaglefiler

Upgrade EagleFiler.app to v1.6.3
Merge pull request #7381 from lahwran/master

Add Quassel's standalone package v0.11.0
Update flashlight to v0.7-alpha
Merge pull request #7416 from jsfaint/master

Update flashlight to v0.7-alpha
Add upeditor (China UnionPay Plugin)
Havanna Add Stringsfile (QuickLook Plugin to preview .strings files)
Merge pull request #7399 from rolandwalker/excalibur_url_exception

Excalibur sourceforge URL exception + tighten all sourceforge regular expressions
Merge pull request #7401 from rolandwalker/remove_depends_on

DSL: remove support for `depends_on_formula`
Upgrade trailer to version 1.1.4
Merge pull request #7423 from srushe/upgrade-trailer-to-114

Upgrade trailer to version 1.1.4
Merge pull request #7417 from Ihavee/upeditor

Add upeditor (China UnionPay Plugin)
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.