pleNx v0.1.1

Features

• Working in-app self-update on Nintendo Switch: when a new release is
  published, pleNx offers to update itself (checked at startup and from
  Settings → "Check for updates"), downloads the NRO with a live progress
  dialog (cancelable), verifies the file size against the GitHub release
  asset before touching anything, then replaces itself and prompts to
  relaunch. On the other platforms the dialog opens the release page in the
  browser.

Fixes

• The updater inherited from Switchfin always wrote the new NRO to
  sdmc:/switch/pleNx/pleNx.nro, while the HOME tile (forwarder) and most
  manual installs launch sdmc:/switch/pleNx.nro: an update could silently
  leave the old version running forever. The app now replaces the NRO it was
  actually launched from (argv[0]). ⚠️ As a consequence, updating from
  0.1.0 through the in-app dialog may appear to have no effect depending on
  the NRO location — 0.1.0 users with the NRO at sdmc:/switch/pleNx.nro
  should replace it manually once.
• The release-asset download URL is no longer hardcoded: URL and expected
  size are taken from the GitHub API response
• The startup update check now honors its intended delay instead of racing
  the plex.tv login requests
• All references to the repository now use its new name thcolin/pleNx
  (the updater, the README, the Debian/Flatpak/AUR metadata) — the GitHub
  redirect from thcolin/plenx kept everything working, but the canonical
  name is safer long-term
• The Arch package version is now derived from CMakeLists.txt instead of
  being hardcoded in the PKGBUILD (the 0.1.1 package was previously
  versioned 0.1.0)