Move defines to their own file

As described in
https://github.com/dwp-forge/columns/issues/5#issuecomment-638467603
sometime the Lexer constants have not been (auto)loaded when a syntax plugin
is in

Move defines to their own file

As described in
https://github.com/dwp-forge/columns/issues/5#issuecomment-638467603
sometime the Lexer constants have not been (auto)loaded when a syntax plugin
is invoked (I'm not sure why).

In general PSR2 discourages a mix of main code and function/class setup
with the call to define() being considered main code.

This patch moves these the define calls to a separate new file, solving
both of the above problems.

These are not all our defines. Instead I focused on the ones that are
ENUM-like.

In the future we should think about what defines can be replaced by
class constants and what other define() calls should be moved.

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Changes to conform to PHP Code Style

New function lang_has_changed() as wrapper for _get_collator(TRUE).

fix phpdoc

Co-authored-by: Matthias Gutjahr <mattsches@gmail.com>

Collator re-creation in unit test

Fix accessing calls

Some plugins need access to the handler (and rewriter) calls. One
example is the do plugin.

This adds some accessing methods to the callWriter objects, ensures
$calls can be acc

Fix accessing calls

Some plugins need access to the handler (and rewriter) calls. One
example is the do plugin.

This adds some accessing methods to the callWriter objects, ensures
$calls can be accessed and removes some duplicate code by introducing an
abstract base class.

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fix the case lookup table. #3113

This readds a whole bunch of conversions that for some reason got lost
in the refactoring. No idea what happened there.

some minor improvements for the writability checks

* handle is_writable for non-existing pages correctly
* Success and Fail are now color coded correctly

fixed message classes

In #3069 the internal structure of messages was accidentally changed to
be numeric. This reintroduces the proper string constants.

I thought about keeping the integers and do

fixed message classes

In #3069 the internal structure of messages was accidentally changed to
be numeric. This reintroduces the proper string constants.

I thought about keeping the integers and do the mapping in
html_msgarea() but some plugins rely on inspecting the global $MSG so I
don't want to change it.

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fix hierarchical breadcrumbs #3114

fix formatting errors in template.php

These were introduced in #2684

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Documentation update

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FatalException: drop unused $status property

The property is never assigned

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Comments with altered files removed