NetInspector v0.4.0

What's Changed

• Add periodic background scanning and new/vanished device alerts by @EnthusiastDeveloper in #15
• Add Wi-Fi changes: diff two persisted scan sessions by @EnthusiastDeveloper in #16
• Add AP capability diffing for known access points by @EnthusiastDeveloper in #17
• Fix Wi-Fi screen bugs found in manual testing by @EnthusiastDeveloper in #18

Full Changelog: v0.3.0...v0.4.0