do not drop undefined settings when saving the configuration

fix numericopt setting

In 55a4f137738ef5718cc047e5fb802e1c6d0a409f a bug was introduced that

* forced resaving the config even if it hadn't changed
* prevented setting the value to an empty string

fix numericopt setting

In 55a4f137738ef5718cc047e5fb802e1c6d0a409f a bug was introduced that

* forced resaving the config even if it hadn't changed
* prevented setting the value to an empty string once set

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improve update() comments

make abstract test abstract again

fixed updateSettings iteration

make the onoff setting more boolean

We now parse true and false as well as some common strings

some more testing

fix language and TOC handling

Fixed some bugs in the Loader and added tests

removed obsolete language files

These shouldn't be there anymore since the plugins have been deleted

some more tests on the output mechanism

Some first Setting class tests

proper defaults for initialize

There isn't really unset variables, but we do expect null to be passed
for some of them.

This also moves the update method further up as it's logically the next
step.

extract save checking into own method

Instead of having the out() method return empty strings, a new method
tells the writer if a setting should be saved or not. Only then the
out() method is called.

sucess is green

basic test for the Writer class

check for opcache function before using it

Moved settings to their own namespace

replaced ptln() with echo

We used to use ptln to ensure the produced HTML source code is somewhat
readable, but with modern HTML inspectors this is no longer necessary
and makes the PHP source code

replaced ptln() with echo

We used to use ptln to ensure the produced HTML source code is somewhat
readable, but with modern HTML inspectors this is no longer necessary
and makes the PHP source code ugly.

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translation update

translation update

translation update

translation update

corectly disable sniff for one file

translation update