Public page response

[juliushaertl]

Use the new PublicPageResponse for NC14+ to render public pages that have the same header actions as the files_sharing app.

Fixes https://github.com/nextcloud/gallery/issues/403 and https://github.com/nextcloud/gallery/issues/358

Requires https://github.com/nextcloud/server/pull/9084

[juliushaertl]

Tests are fixed, they still fail because the new classes from nextcloud/server#9084 are not available. Once that is merged they should run fine.

[MorrisJobke]

Tests are fixed, they still fail because the new classes from nextcloud/server#9084 are not available. Once that is merged they should run fine.

Retriggered them, because server PR was merged.

[codecov[bot]]

Codecov Report

Merging #425 into master will increase coverage by 0.05%. The diff coverage is 83.33%.

@@             Coverage Diff              @@
##             master     #425      +/-   ##
============================================
+ Coverage     82.55%   82.61%   +0.05%     
  Complexity      360      360              
============================================
  Files            38       38              
  Lines          1313     1323      +10     
============================================
+ Hits           1084     1093       +9     
- Misses          229      230       +1

Impacted Files	Coverage Δ	Complexity Δ
lib/AppInfo/Application.php	74.37% <0%> (-0.38%)	28 <0> (ø)
lib/Controller/PageController.php	100% <100%> (ø)	12 <0> (ø)	:arrow_down:

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[oparoz]

Look at all this beautiful green :)