<p>It's useful to be able to attach arbitrary data to documents, especially for plugins. This PR adds GObject-like keyed data lists to documents so plugins can add stuff similar to <code>g_object_get|set_data()</code>. The first commit adds a simple wrapper to the document module, the second exposes a safe API for plugins.</p>

<p>In the future if GeanyDocument is ever converted to a GObject, the new <code>document_get|set_data()</code> functions could become simple wrappers around <code>g_object_get|set_data()</code> rather than using keyed data lists directly.</p>

<p>Aside from conventional plugins, this will also be useful for planned "filetype plugins" from <a href="https://github.com/geany/geany/issues/1195" class="issue-link js-issue-link" data-url="https://github.com/geany/geany/issues/1195" data-id="173359447" data-error-text="Failed to load issue title" data-permission-text="Issue title is private">#1195</a> and possibly for certain proxy plugin implementations, and could even prove useful in the core.</p>

<p>A made a very simple test plugin to tinker with this in <a href="https://github.com/codebrainz/geany/commit/b662ba3ca15969429ee2f9cf4c00e84024e499bd" class="commit-link">codebrainz@<tt>b662ba3</tt></a>.</p>

<hr>

<h4>You can view, comment on, or merge this pull request online at:</h4>
<p>  <a href='https://github.com/geany/geany/pull/1203'>https://github.com/geany/geany/pull/1203</a></p>

<h4>Commit Summary</h4>
<ul>
  <li>Add support for Keyed Data Lists for documents</li>
  <li>Add plugin API functions to get/set document data</li>
</ul>

<h4>File Changes</h4>
<ul>
  <li>
    <strong>M</strong>
    <a href="https://github.com/geany/geany/pull/1203/files#diff-0">src/document.c</a>
    (23)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/geany/geany/pull/1203/files#diff-1">src/document.h</a>
    (7)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/geany/geany/pull/1203/files#diff-2">src/documentprivate.h</a>
    (2)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/geany/geany/pull/1203/files#diff-3">src/plugins.c</a>
    (39)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/geany/geany/pull/1203/files#diff-4">src/pluginutils.c</a>
    (153)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/geany/geany/pull/1203/files#diff-5">src/pluginutils.h</a>
    (11)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/geany/geany/pull/1203.patch'>https://github.com/geany/geany/pull/1203.patch</a></li>
  <li><a href='https://github.com/geany/geany/pull/1203.diff'>https://github.com/geany/geany/pull/1203.diff</a></li>
</ul>

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