FX.6 Tutorials: each app's What's new said 0.7; now 0.8 and 0.8.1

The eight apps' What's new help topics still described 0.7, including in the frozen 0.8.1 builds. New "What's new in 0.8 and 0.8.1" topics written from the release notes (a Discord member help, compiled); the 0.7 text stays as whats-new-0-7. The site shows the a Discord member copy of the release-note topics only when its title names the shown build (Help::withReleaseNotes); the 0.8.1 builds' in-app help still has the 0.7 text. Translations of the topic are stale. The eight pages were written by background agents; only TakeoffCraft's was read through by hand.