dev-core#1079: Improper character encoding breaks xml processor

[monishdeb]

Overview

When printing a case, if the contact name has an ampersand (&) it breaks loadXML due to improper encoding, resulting in the activity listing not displaying.
Steps to replicate:

1. Create a Case where client name should have & character
2. Go to 'Manage Case'
3. Click 'Print Report'

Before

There are no activities on the preview screen.

After

Activities are listed on the preview screen

Comments

ping @colemanw @lcdservices

[civibot]

(Standard links)

• If this is your first pull-request for CiviCRM, please browse CONTRIBUTING.md for information about the development and testing processes.
• If you are reviewing this pull-request, you may wish to consult the test sites and the Review Standards (long template, short template).

[lcdservices]

Tested and confirmed. Activities are listed when a client name has an ampersand.

[eileenmcnaughton]

The level of testing here seems appropriate to the change given the bug was replicable. In addition the change adds good practice (use of escape at the tpl layer)