Alexander Volkov

Fix reading files with apostrophe in the header section.

1

Fix two problems. 1. Header reader failes on user name with apostrophe: `FILE_NAME('1.ifc','2022-01-28T15:23:18',('admin\X\27'),(''),'IfcPlusPlus','','');` 2. Duplicating `\` or `'` when read string atributes of entites: `#53= IFCCOLUMN('2Vl8RxOHj99fWB7IRf2gY0',$,'Column1',$,$,#58,#81,'\\',$);` ISO 10303-21 standard states...