Get/Set methods for PrintHeadings, PrintGridlines properties. (#1259)
Get/Set methods for PrintHeadings, PrintGridlines properties. (#1259)

* Get/Set methods for PrintHeadings, PrintGridlines properties.

* [se] Fix

Co-authored-by: Alexander Trofimov <af31c36917c73338c0618e705266e2e48d025f1e@onlyoffice.com>
ONLYOFFICE/sdkjs,ONLYOFFICE/sdkjs,ONLYOFFICE/sdkjs,ONLYOFFICE/sdkjs,ONLYOFFICE/sdkjs