Fix unclickable links GSPOE-20

[marionb]

Fix #38
This PR:

• makes it possible to open links when clicking on them in all PDF viewers
• cleans up the code for hyperlinks and avoids using long code elements in text fields. Instead PrintWhenExpressions are used when possible.

IMPORTANT NOTE:
when creating a hyperlink in one of the templates, use the following example:

<textField hyperlinkType="Reference">
  <reportElement x="5" y="95" width="300" height="15"/>
  <textFieldExpression class="java.lang.String">"  >> Click here to go to www.google.com"</textFieldExpression>
  <hyperlinkReferenceExpression>"http://www.google.com"</hyperlinkReferenceExpression>
</textField>

Do NOT add hyperlinkTarget="Blank" ! This will break the link for many PDF readers.
http://jasperreports.sourceforge.net/sample.reference/hyperlink/index.html

[jwkaltz]

Tested with pyramid_oereb dummy report, on Microsoft Edge PDF reader, Firefox PDF reader, Chrome, Adobe Acrobat (on Windows).
This fixes the hyperlinks (but does not provide a box around the whole link, as some tools such as Word do).