4.0.0

What's Changed

• [maven-release-plugin] prepare release 4.0.0 by @openmrs-bot
• Updated to released 2.8.3 version of Core by @mogoodrich
• ATT-60: Attachments should properly populate filename based on update… (#81) by @mogoodrich
• AT-62: Attachments tech debt by @mogoodrich
• AT-62: Attachments tech debt by @mogoodrich
• ATT-62: Cleanup technical debt and refactor module structure (#79) by @Mr-Imperium
• ATT-61 - Remove auto-wiring inside service impl (#78) by @mseaton
• ATT-59 - Follow-up fix to remove commons-io from lib by @mseaton
• ignore attachment resource test until we figure out how to mock it properly by @mogoodrich
• remove commons-io library (it is bundled with Core) by @mogoodrich
• ATT-59: Adjust attachments module to use StorageService (#77) by @mogoodrich
• [maven-release-plugin] prepare for next development iteration by @openmrs-bot