[BUILD] - Adds update check in build process, and refactors

[Lissy93]

Category: Build update

Overview

• Added missing appConfig.disableUpdateChecks attribute to schema
  • I forgot to do this in [FEATURE] Shows update status next to version #101
• Checks for updates when app builds
• Moves Schema checker into services directory

Issue Number N/A

New Vars N/A

Screenshot N/A

Code Quality Checklist (Please complete)

• All changes are backwards compatible
• All lint checks and tests are passing
• There are no (new) build warnings or errors
• (If a new config option is added) Attribute is outlined in the schema and documented
• (If a new dependency is added) Package is essential, and has been checked out for security or performance

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