Remove 1.8 NMS spawner providers (#3276)

This PR removes the 1.8 R1 and R2 spawner providers. I was looking into refactoring these to use reflection instead of importing NMS code (in order to avoid requiring buildtools to compile), but after some research it looks like these are actually not even used anymore, in favor of the LegacySpawnerProvider (which Essentials appears to use for 1.8.0-1.12.2). Thus, keeping these is fairly pointless and causes more harm than good. There is no reason to continue including them, nor maintaining them. Essentials currently doesn't even officially support these versions anyway.

Essentials/src/com/earth2me/essentials/Essentials.java

@@ -48,8 +48,6 @@
 import net.ess3.nms.refl.ReflSpawnEggProvider;
 import net.ess3.nms.updatedmeta.BasePotionDataProvider;
 import net.ess3.nms.updatedmeta.BlockMetaSpawnerProvider;
-import net.ess3.nms.v1_8_R1.v1_8_R1SpawnerProvider;
-import net.ess3.nms.v1_8_R2.v1_8_R2SpawnerProvider;
 import net.ess3.providers.ProviderFactory;
 import org.bukkit.Bukkit;
 import org.bukkit.Server;
@@ -251,8 +249,6 @@ public void onEnable() {
                 spawnerProvider = new ProviderFactory<>(getLogger(),
                         Arrays.asList(
                                 BlockMetaSpawnerProvider.class,
-                                v1_8_R2SpawnerProvider.class,
-                                v1_8_R1SpawnerProvider.class,
                                 LegacySpawnerProvider.class
                         ), "mob spawner").getProvider();
                 spawnEggProvider = new ProviderFactory<>(getLogger(),

pom.xml

@@ -51,8 +51,6 @@
         <module>EssentialsXMPP</module>
         <module>nms/NMSProvider</module>
         <module>nms/UpdatedMetaProvider</module>
-        <module>nms/1_8_R1Provider</module>
-        <module>nms/1_8_R2Provider</module>
         <module>nms/LegacyProvider</module>
         <module>nms/ReflectionProvider</module>
         <module>nms/FlattenedProvider</module>