AT File littered with "unused" entries

[gabizou]

Please include the following information in all issues:

• Minecraft Development for IntelliJ plugin version : 2018.2-1.2.10-113
  IntelliJ IDEA 2018.2.3 (Ultimate Edition)
  Build #IU-182.4323.46, built on September 3, 2018
  JRE: 1.8.0_152-release-1248-b8 x86_64
  JVM: OpenJDK 64-Bit Server VM by JetBrains s.r.o
  macOS 10.13.6

Certain AT entries are being marked as unused by the plugin, even though they're used in production code (non-mixins). I know there's a bit of a rewrite going on with AT handling, so I'll be testing again when given the version or if it's on nightly.

Related code using one of the highlighted AT entries: https://github.com/SpongePowered/SpongeCommon/blob/2e431bf8328cad5b43370cb1bf748b4eb762f01d/src/main/java/org/spongepowered/common/data/datasync/entity/EntityFlagsConverter.java#L40