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 'default' parameter from function 'getOption'

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

Fix spurious spaces around inline elements

Without this fix, the code adds a block separator after each element,
which translates to a space before and after each element, including
bold, italics, e

Fix spurious spaces around inline elements

Without this fix, the code adds a block separator after each element,
which translates to a space before and after each element, including
bold, italics, etc. This is especially visible when the element is
followed by punctuation.

The fix makes the code only add a block separator after block elements.

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first 2.0 implementation - at least no error

theleague/commonmark 2.0.x compatibility matching

first working version