Pdfreader

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- don't raise error on unsupported stream filters, return raw unfiltered data instead
- issue 101 - DCT stream data encoding support
- issue 130 - PDF date regular expression fixed
- issue 62 - work around unbalanced BT/ET
- reduced warnings logs noise
- timezone issue in tests fixed
- bitarray version bump to 2.9.2

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- issue 106 - use Unicode replace character when codes are out of Unicode range

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- issue 109 - work around unexpected predictors and corrupted images
- Bump pycryptodome from 3.9.9 to 3.19.1
- issue 113 - get rid of `pkg_resources`
- issue 93 - logging issue
- issue 99 - color space lookups issue fixed

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- issue 70 - Encrypt value as a reference
- issue 91 - broken links in the docs
- issue 92 - make PDFDocuments and SimplePDFViewers context managers

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- broken links to PDF spec fixed
- issue 83 - warn on generation overflow
- a85decode correctly handles the adobe ascii85 alphabet.

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- Issue 77: Codecs issue
- minor documentation updates