v0.400.0-alpha.0 (Holochain v0.4.0-dev.1)

What's Changed

• Fix UI layout issues by @mrruby in #81
• Add window icons by @matthme in #82
• Bump to 0.4.0-dev.1 and adapt to new devhub/appstore by @matthme in #84
• Add deterministic hash checks, logging errors to console by @matthme in #85
• Fetch webhapps in backend by @matthme in #86
• Feat/load webhapp default data by @mrruby in #90
• Feat/UI enhancement by @mrruby in #93

Full Changelog: v0.300.0-alpha.2...v0.400.0-alpha.0