v1.2.0-RC1

Bug fix and performance release

❗Not production ready - We reworked our code base and added typed parameters as well as return values. If you find anything, please drop us a comment. Further information can be found #468. Thank you in advance!❗

Highlights:

• massive code refactoring (thanks to @jee7, #440)
• workaround to enable FPDFs (thanks to @izabala, #453)
• Added cache for Documents object cache dictionary, which also results in better performance in some cases (thanks to @jee7, #434)
• prevent endless loops during Page->getText() in some cases (thanks to @Nickmanbear, #457)
• Fixes invalid return type on unknown glyphs (thanks to @PrinsFrank, #459)
• Fix TypeError on Document::getFirstFont when no fonts are available (thanks to @PrinsFrank, #461)

@j0k3r improved our test backend.