* vcard: Fix whitespace handling in line cont's
Previously, multiple whitespace characters at the start of a
continuation line would all be dropped, instead of only the first one.
Also,
- restrict line continuation characters to SPACE and TAB.
Note that, like before, this identifies the CR (`\r`) character with the
empty string, and thereby notably does not require a CRLF (`\r\n`)
sequence (which is mandated by RFCs 2426, 2425) for line termination
(i.e., `\n` suffices).
Fixes: Bug 1 of issue #9593.
* vcard: Add test for #9593/1
* Fix coding style
* Check plugins composer.json using CI
* Add "require-dev" and "config.allow-plugins" to plugins
* fix composer.json format - rm invalid email
* fix composer.json format - fix ext require
* fix composer.json format - fix plugin name
* tmp
* Revert "tmp"
* fix ext in ext install
* disable plugin in plugin install until Roundcube is fully autoloadable
* fix composer.json format - fix non-canonical license name
* Revert "Add "require-dev" and "config.allow-plugins" to plugins"
* no composer install for plugins needed
* Revert "fix ext in ext install"
* add standard "Test" suffix to phpunit files
* rm unneeded "suffix" in phpunit config
* simplify phpunit config
* fix default "xhtml" doctype in unit testing
* fix test_format_date test to not rely on other tests
* even more phpunit config simplify
* stricter/unify phpunit params for E2E tests
* run E2E tests on maximal php version too with lowest deps
* "repositories" in bundled plugins are useless as for root package only
* add/unify missing plugin test