Fix for detection of marked content position

[KateOrient]

Closes https://trello.com/c/ttjRjDxc

PR includes the following changes:

• Removed EMC (OPS.endMarkedContent) operator from the list of operators that are processed as ones inside the content item. This prevents us from forming unnecessary content items each time we meet the end of the content item block.
• Replaced simple strings conversion to UTF-8 with a proper and safe one (stringToPDFString) during the structure tree parsing. This fixes Failed to parse structure tree element: URI malformed errors and ensures we do not throw the whole structure element away in case it includes a string that cannot be fully decoded.

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[KateOrient]

Wrong bounding box detected by context