Register 'commonmark/hard_break' as an custom option

So we have all the default parameters in one place,
and not hidden within the renderer function.
Also adapt the 'getOption' function such that it

Register 'commonmark/hard_break' as an custom option

So we have all the default parameters in one place,
and not hidden within the renderer function.
Also adapt the 'getOption' function such that it is able
to retrieve both, leage-commonmark options as well as our
custom registered commonmark options.

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Remove further ignored default parameters from function calls

The given default parameter is not taken into account anyways
(a source of confusion), and it will get in the way when we
change the fun

Remove further ignored default parameters from function calls

The given default parameter is not taken into account anyways
(a source of confusion), and it will get in the way when we
change the function signature later, for individual commonmark
options.

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Implement optional soft break rendering

When the option 'render_softbreaks' is on, use the same
line break characters as for hart breaks.
Also, define the hart break string inside the
'Commonmark.ph

Implement optional soft break rendering

When the option 'render_softbreaks' is on, use the same
line break characters as for hart breaks.
Also, define the hart break string inside the
'Commonmark.php' config, not in the renderer itself.

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Remove 'default' parameter from function 'getOption'

The underlying 'get' function from 'environment'
->'getConfiguration()'->'get()' does not have a default
parameter any more.

fix html tag escape

fix list rendering issue with strikethrough text

Revert "auto parsing slash to colon inside wikilink"

This reverts commit 41bb96e58a7e78dafbb7d90816ef3412ade890ed.

auto parsing slash to colon inside wikilink

first 2.0 implementation - at least no error

theleague/commonmark 2.0.x compatibility matching

fix multiline indented code block rendering issue

fix escaping issue on indented code block

fix hr rendering error after list (#16)

prevent inline render inside <code>

fix footnote inside block

fix escape option in inline / block code

Fix default code block process issue

add table syntax

add footnote support

disable escape on text rendering

support h6~ problem (treat all as h6)

fix default tag option

fix namespace & heading number

fix typo

revise descriptions