Add jira macro

[osnard]

Example:

<ac:structured-macro ac:name="jira" ac:schema-version="1" ac:macro-id="...">
  <ac:parameter ac:name="server">...</ac:parameter>
  <ac:parameter ac:name="serverId">...</ac:parameter>
  <ac:parameter ac:name="key">...</ac:parameter>
</ac:structured-macro>

Parameters: key, jqlQuery, server, serverId, serverUrl, showSummary