code style fixes for Logger

Allow tests to expect log messages

make sure stderr is defined in logger

STDERR is only defined when PHP is called from the command line.

In the docker health check we set DOKU_UNITTEST to make sure that errors
trigger exceptions in

make sure stderr is defined in logger

STDERR is only defined when PHP is called from the command line.

In the docker health check we set DOKU_UNITTEST to make sure that errors
trigger exceptions instead being logged only. However when the error
then is also written to STDERR it fails.

This patch makes sure the data is written to PHP's STDERR stream handler
instead.

Should fix dokuwiki/docker#15

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Log in local time instead of utc

code style: static visibility

coding style: function call spacing

apply PSR-12 constant visibility rule

PSR-12 says constants need their visibility declared from PHP 7.1
onwards

Apply rector fixes to the rest of inc

output log messages to STDERR during unit testig

This is especially helpful to notice deprecation messages

log deprecation messages independent from allowdebug

Only the logging configuration should influnece if deprecation messages
are to be logged. By default they should be logged.

correctly create log file name. fixes #3699

strtoftime does not always recognize Unix Timestamps

Ignore missing event system in logging #3614

Logger: add event to intercept and change the logged data

In some environments you may want to have logs but not have them stored
in the default location or may want a different logging format.

Thi

Logger: add event to intercept and change the logged data

In some environments you may want to have logs but not have them stored
in the default location or may want a different logging format.

This event allows plugins to do that.

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Fix array access on null in Logger.php

Fixes #3391

added logging configuration

Log facitlities can now be disabled. By default only debug is disabled.
It might make sense to by default disable deprecated as well?

Debug logging is now independend of

added logging configuration

Log facitlities can now be disabled. By default only debug is disabled.
It might make sense to by default disable deprecated as well?

Debug logging is now independend of the allowdebug method. allowdebug
was often used in two ways: for displaying errors directly to the user
and for logging to the debug log. Now it only controls the former.

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added convenience methods to log to our default facilities

added logviwer admin plugin

This allows for easy viewing of the available logs.

The log format was sligthly adjusted again for easier parsing.

central logging mechanism

This introduces a logger mechanism and a new data/log directory. This is
a first proof of concept. It's built on top of the new global error
handling mechanism

Things to d

central logging mechanism

This introduces a logger mechanism and a new data/log directory. This is
a first proof of concept. It's built on top of the new global error
handling mechanism

Things to discuss:

* should we adopt PSR-3 somehow? if yes, how and should plugins be able
to drop-in other psr3 loggers?
* how to configure which facilities shall be logged?
* should we implement a log deletion feature?
* is the log format sensible?
* should we implement a log viewer admin plugin?
* should logging trigger events (it should maybe replace the
deprecation event)

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