Don't blindly trust toUnicode when building toFontChar for non-standard fonts without a font file (issue 4934)
Additional heuristics to recognize unknown glyphs for toUnicode (bug 1027533)
Fix code style issues in pdf_find_controller.js and build strings more efficiently
Implement text normalization for page content and queries
Use null instead of [] for ops with no args.

This reduces peak RSS on one test file from ~600 to ~560 MiB.
Refactoring text layer builder
Convert the text layer builder to a class
Refactoring PDFFindController in the text layer builder
Merge pull request #4987 from timvandermeij/text-search-refactoring

Refactoring PDF find controller and implementing page content and query normalization
Merge pull request #4982 from nnethercote/use-null-for-zero-args

Use null instead of [] for ops with no args.
Removing unnecessary includes from text selection example
Merge pull request #4991 from timvandermeij/text-layer-builder-refactoring

Refactoring text layer builder and converting text layer builder to a class
Restructured EvaluatorPreprocessor_read to be more natural.
Merge pull request #4944 from Snuffleupagus/issue-4934

Don't blindly trust toUnicode when building toFontChar for non-standard fonts without a font file (issue 4934)
Merge pull request #4976 from CodingFabian/restructure-evaluator-read

Restructured EvaluatorPreprocessor_read to be more natural.
Merge pull request #4980 from Snuffleupagus/bug-1027533

Additional heuristics to recognize unknown glyphs for toUnicode (bug 1027533)
Merge branch 'master' of https://github.com/mozilla/pdf.js into refactor_chunked_stream