Improve wording: Remove master and blacklist & whitelist terminology

[sudwhiwdh]

Prerequisites

• I performed a cursory search of the issue tracker to avoid opening a duplicate issue
  • Your issue may already be reported.
  • I also searched the existing issues at https://github.com/gorhill/uMatrix/issues
• This is not a support issue or a question
  • Support issues and questions are handled at /r/uMatrix
• I tried to reproduce the issue when...
  • uMatrix is the only extension
  • uMatrix with default lists/settings
  • using a new, unmodified browser profile
• I am running the latest version of uMatrix
• I checked the documentation to understand that the issue I report is not a normal behavior
• I used the logger to rule out that the issue is caused by my ruleset

Description

In response to recent events, I ask you to help ensure that your add-on no longer discriminates by language.
This applies to the naming of the development branch, the filter lists in the add-on itself and the wiki pages such as https://github.com/gorhill/uMatrix/wiki/Preset-whitelisted-and-blacklisted-domains.