hqmf_r2.1: replace observationReference with criteriaReference in templates
hqmf_r2.1: id should not have a nested item element
hqmf_r2.1: replace encounterReference with criteriaReference in templates
hqmf_r2.1: do not generate 'type' attribute in pauseQuantity
hqmf_r2.1: replace procedureReference with criteriaReference in templates
Merge branch 'hqmf_r2.1' of https://github.com/projectcypress/health-data-standards into hqmf_r2.1
hqmf_r2.1: Generate child 'uncertainRange' element for 'pauseQuantity'
fix invalid xml in measurePeriod template