Make common_pageinfo tests independent of execution order

The pageinfo() tests relied on running in a fixed order: test_editor_and_externaledits
mutated wiki:syntax (changelog entry + file mtime), a

Make common_pageinfo tests independent of execution order

The pageinfo() tests relied on running in a fixed order: test_editor_and_externaledits
mutated wiki:syntax (changelog entry + file mtime), and the other tests relied on
that page being pristine. Move the mutating test to its own page (wiki:dokuwiki) so
the shared per-class data dir stays clean, prime the last_change metadata within each
test instead of across tests, and fix the affected expectations. The suite now passes
in isolation and in random/reverse order.

While here, modernize the file:
- capture the pageinfo() result once instead of calling it twice
- add public/protected visibility markers to all methods
- convert array() to the short [] syntax
- replace the deprecated addLogEntry() with the PageFile API it wraps

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Merge branch 'master' into revisionHandle3

fix test for draft file

UnitTest of pageinfo(), saveWikiText()

ChangeLog creates early .change file, p_get_metadata() will get full "meta_last_change" entry. The current key in the revinfo need to be excluded prior to p_s

UnitTest of pageinfo(), saveWikiText()

ChangeLog creates early .change file, p_get_metadata() will get full "meta_last_change" entry. The current key in the revinfo need to be excluded prior to p_set_metadata() call.

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add needed type hints for phpunit8

This will break a lot of plugin tests, but can't be avoided

let path to revision file in tests depend on compression setting

fixed test cases for last commit

crlf 2 lf whitespace fixes

add unit test for pageinfo()