add needed type hints for phpunit8

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

Rename fields and add deprecated __get/__set

These fields might still be accessed from the outside, so in order to
not break backwards compatibility, this uses magic methods that emit
deprecation er

Rename fields and add deprecated __get/__set

These fields might still be accessed from the outside, so in order to
not break backwards compatibility, this uses magic methods that emit
deprecation errors.

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Refactor cache.php into different files

introduce new "flaky" test group

this group is skipped by default

skip cache test until #694 has been fixed

Issue 694: fix failing test - set filemtimes explicitly in test setup

put PHPDocs comment back the way it should be

Fix longstanding issue with cache class & cachetime setting

1. cachetime setting should only be applied to the cache_renderer
class. Previously it was applied to cache_parser (and by
extensio

Fix longstanding issue with cache class & cachetime setting

1. cachetime setting should only be applied to the cache_renderer
class. Previously it was applied to cache_parser (and by
extension cache_handler).
2. two special cachetime values, -1 & 0, weren't handled, per
FS#2183

To handle the cachetime setting, -1, disable caching, a new
property _nocache is added. When that property is true, any cache
file must not be used and storecache() should not store any values

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Add a basic test case for the cache

This very basic test ensures that the useCache method works as
expected for simple scenarios. This test case fails without commit
a8795974051a91137b01ff88dbf5586a

Add a basic test case for the cache

This very basic test ensures that the useCache method works as
expected for simple scenarios. This test case fails without commit
a8795974051a91137b01ff88dbf5586a647b24ce and then also triggers the
warning that was introduced in bc2ddb548f71b1a822dd03c3bc7c3c0e7cd9b152

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