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These questions are answered by previous implementation.

Add patch step to install instructions and properly
name patch file.

This update requires the included patch to add the needed
callbacks to the mobile reply page.

Now TimeTaken doesn't need a hardcoded "next if" inside the
CheckMandatoryFields method.

TimeTaken is only relevant on update, so skip if validating
on create.

Remove unnecessary full package name for method call and
referring to package variables.

Move the mandatory checking logic into a new method CheckMandatoryFields
in the main module to make it available from both create and update.

Also make CheckMandatoryFields work with both update where a ticket
already exists and create where it hasn't yet been created.