text: Title: Update or remove outdated files in the repository root directory
  Body: ## Classification:
  
  Bug, Enhancement
  
  
  ## Summary
  
  Update the supplementary files in the autokey repository root to the current state.
  Currently, several files are out-of-date and unusable.
  Update: 
  - [ ] - `autokey.spec` The openSUSE (?) package build specification is still on version 0.94.1. Update it to be able to build RPMs of the newest version
  - [ ] - `extractDoc.py` This was seemingly used to extract the Qt autocompletion specification. This is still old Python 2 code and contains the old source path. Update this to be able to update the autocompletion automatically.
  - [ ] - `PKG-INFO` This is still on version 0.90.4 and should either be updated or removed.
  - [x] - `TODO` This TODO file isn’t really helpful and can probably be removed. https://github.com/autokey/autokey/commit/3f4bf23f8ad140def989ede70db6b29f74e9499d
  - [x] - `INSTALL` is slightly outdated, mentions `python` instead of `python3` https://github.com/autokey/autokey/commit/bfa96d1a339e26bd3ae67787920cbc1a0b9a0601
  
  ## Version 
  
  AutoKey version: all up to the current git master and develop branch
  