Continue a definition term on the lines below it

[dereuromark]

A definition term now continues on the lines below it until a blank line, as in djot.js 9790d4d.

: t
tail

djot.js:

<dl>
<dt>t
tail</dt>
<dd>
</dd>
</dl>

djot-php before: <dt>t</dt>, then <p>tail</p> after the list. A line indented by two or more spaces started the definition instead (: t, tail gave <dd><p>tail</p></dd>). Only a one-space line continued the term.

The syntax description: "the first line or lines after the : marker is parsed as inline content and taken to be the term defined." Its examples always put a blank line between the term and the definition.

What can break

A definition written directly under its term, without a blank line:

: Term
  Definition of the term.

That is now one term, "Term Definition of the term.", with an empty definition, which is also how djot.js reads it. Two docs examples (why-djot.md, the ANSI cookbook) were written this way and get the blank line. HtmlToDjot already writes the blank line, so converted documents are unaffected. A term attribute line ({.c} at column 0 under the term) still attaches to the term.

Measured against djot.js

No change on the 4853 generated block-family inputs (1077 before and after, on top of #312): none of them has a non-blank line right after a term once the other differences are counted. The about 115 cases the earlier analysis put in this family were minimized forms in which the blank line had been deleted.

Not changed: consecutive : term lines still share one definition, a djot-php extension; djot.js gives each its own empty definition.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.07%. Comparing base (5d29dce) to head (11390c4).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #313   +/-   ##
=========================================
  Coverage     93.06%   93.07%           
- Complexity     4729     4732    +3     
=========================================
  Files           118      118           
  Lines         12635    12636    +1     
=========================================
+ Hits          11759    11761    +2     
+ Misses          876      875    -1     

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