Removed various depreciated functions; fix #975

[Balearica]

Removes various depreciated/legacy code.

1. Removed loadLanguage/initialize/getPDF functions.
   • While there is not much harm in keeping these, they have been depreciated for multiple major versions, and I'm hopeful that removing them will prevent them from being suggested in LLM code suggestions (which still happens).
2. Removed tessjs_create_osd/tessjs_create_box/etc. options.
   • These were used to set output formats prior to v3.
3. Removed default options (resolves Parameters set using createWorker config argument overwritten by default arguments #975)
   • None of our defaults are currently different from the Tesseract defaults, however setting these was overwriting user-provided parameters.