Fix various corrupt PDF files (issue 9252, issue 9418)#9827

Merged

timvandermeij merged 6 commits intomozilla:masterfrom

Snuffleupagus:misc-corrupt-pdf-fixes

Jun 21, 2018

Commits on Jun 20, 2018

Ensure that line-breaks are *only* skipped after operators in `Lexer.getNumber` (PR 8359 follow-up)
Snuffleupagus
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Let `Lexer.getNumber` treat a single decimal point as zero (issue 9252)
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Use the correct `startPos` when repeating the search for 'endobj' operators in `XRef.indexObjects` (PR 9288 follow-up)
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Prevent hard errors if fetching the `Encrypt` dictionary fails in `XRef.parse`
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Add basic validation of the 'Root' dictionary in `XRef.parse` and try to recover when possible
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Add basic validation of the 'trailer' dictionary candidates in `XRef.indexObjects` (issue 9418)
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