Begin implementation of CheckStyle style checking

By: md_5 <git@md-5.net>

paper-api/src/main/java/org/bukkit/block/Block.java

@@ -241,7 +241,7 @@ public interface Block extends Metadatable {
     /**
      * Gets the face relation of this block compared to the given block.
      * <p>
-     * For example: 
+     * For example:
      * <pre>{@code
      * Block current = world.getBlockAt(100, 100, 100);
      * Block target = world.getBlockAt(100, 101, 100);

paper-api/src/main/java/org/bukkit/block/Dropper.java

@@ -14,7 +14,7 @@ public interface Dropper extends Container, Lootable {
      * Normal behavior of a dropper is as follows:
      * <p>
      * If the block that the dropper is facing is an InventoryHolder,
-     * the randomly selected ItemStack is placed within that 
+     * the randomly selected ItemStack is placed within that
      * Inventory in the first slot that's available, starting with 0 and
      * counting up.  If the inventory is full, nothing happens.
      * <p>
@@ -24,7 +24,7 @@ public interface Dropper extends Container, Lootable {
      * <p>
      * If the block represented by this state is no longer a dropper, this will
      * do nothing.
-     * 
+     *
      * @throws IllegalStateException if this block state is not placed
      */
     public void drop();

paper-api/src/main/java/org/bukkit/block/EndGateway.java

@@ -9,11 +9,11 @@ import org.jetbrains.annotations.Nullable;
 public interface EndGateway extends BlockState {
 
     /**
-     * Gets the location that entities are teleported to when 
+     * Gets the location that entities are teleported to when
      * entering the gateway portal.
      * <p>
      * If this block state is not placed the location's world will be null.
-     * 
+     *
      * @return the gateway exit location
      */
     @Nullable
@@ -24,7 +24,7 @@ public interface EndGateway extends BlockState {
      * they enter the gateway portal.
      * <p>
      * If this block state is not placed the location's world has to be null.
-     * 
+     *
      * @param location the new exit location
      * @throws IllegalArgumentException for differing worlds
      */
@@ -33,7 +33,7 @@ public interface EndGateway extends BlockState {
     /**
      * Gets whether this gateway will teleport entities directly to
      * the exit location instead of finding a nearby location.
-     * 
+     *
      * @return true if the gateway is teleporting to the exact location
      */
     boolean isExactTeleport();
@@ -41,7 +41,7 @@ public interface EndGateway extends BlockState {
     /**
      * Sets whether this gateway will teleport entities directly to
      * the exit location instead of finding a nearby location.
-     * 
+     *
      * @param exact whether to teleport to the exact location
      */
     void setExactTeleport(boolean exact);