Update the wiki for Mumcord 0.4.3
docs: update wiki for 0.4.1 and the upcoming 0.4.2 macOS signing and notarization, keychain and microphone prompts, late-join repeat announcements in the screen share and watch party flows, CI change detection, Dependabot and the apt mirror fallback.
docs: update wiki for 0.4.0 and upcoming 0.4.1
docs: split plugin data protocol into flow and packet pages
docs: add protocol flow diagrams and size limits
docs: update plugin data version rules
docs: add plugin data protocol reference