* Add packed predefined cmaps
* Add cmap cid range parsing
* Load base cmap for predefined cmaps
* Refactor pdfFont to Unicode methods
* Preserve CharcodeBytesToUnicode behavior
* Add support for CID-keyed Type 0 fonts
* Add method documentation for the cmap package
* Refactor and document charcode to Unicode conversion code
* Add more cmap parsing test cases
* Add more method documentation in the cmap package.
* Remove unused code from the bcmaps package
* Improve cmap test case
* Assume identity when encoder is missing on regenerating field appearance
* Add missing encoder log message
* Add inverse CMap mappings
* Add CMap encoder
* Address golint notices and small fix in the cmap package
* Keep smaller charcodes when generating cmap inverse mappings
* Update extractor test case
* Keep latest supplement charcodes/CIDs when computing inverse mappings
* Fix comment typo