Fix reading files with apostrophe in the header section.

[AlexVlk]

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 that: A string shall be encoded as an apostrophe "'", followed by zero or more characters from the basic alphabet, and ended by an apostrophe "'". The null string (string of length zero) shall be encoded by two consecutive apostrophes "''". Within a string, a single apostrophe shall be encoded as two consecutive apostrophes. Within a string, a single reverse solidus "\" shall be encoded as two reverse solidi "\\".

[luzpaz]

Any traction here ?

[ifcquery]

Should be solved with latest update