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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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

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

prevent inline render inside <code>

fix footnote inside block

fix escape option in inline / block code

add footnote support

disable escape on text rendering

revise descriptions

first working version