Add jsr305 annotations to the API

common/src/main/java/me/lucko/luckperms/common/api/ApiProvider.java

@@ -217,18 +217,18 @@ public class ApiProvider implements LuckPermsApi {
 
     @SuppressWarnings("unchecked")
     @Override
-    public void registerContextCalculator(ContextCalculator<?> contextCalculator) {
+    public void registerContextCalculator(@NonNull ContextCalculator<?> contextCalculator) {
         plugin.getContextManager().registerCalculator(contextCalculator);
     }
 
     @Override
-    public Optional<Contexts> getContextForUser(User user) {
+    public Optional<Contexts> getContextForUser(@NonNull User user) {
         return Optional.ofNullable(plugin.getContextForUser(UserDelegate.cast(user)));
     }
 
     @SuppressWarnings("unchecked")
     @Override
-    public ContextSet getContextForPlayer(Object player) {
+    public ContextSet getContextForPlayer(@NonNull Object player) {
         return plugin.getContextManager().getApplicableContext(player);
     }
 }

common/src/main/java/me/lucko/luckperms/common/utils/SenderLogger.java

@@ -26,6 +26,7 @@
 package me.lucko.luckperms.common.utils;
 
 import lombok.AllArgsConstructor;
+import lombok.NonNull;
 
 import me.lucko.luckperms.api.Logger;
 import me.lucko.luckperms.common.commands.sender.Sender;
@@ -36,17 +37,17 @@ public class SenderLogger implements Logger {
     private final Sender console;
 
     @Override
-    public void info(String s) {
+    public void info(@NonNull String s) {
         Message.LOG_INFO.send(console, s);
     }
 
     @Override
-    public void warn(String s) {
+    public void warn(@NonNull String s) {
         Message.LOG_WARN.send(console, s);
     }
 
     @Override
-    public void severe(String s) {
+    public void severe(@NonNull String s) {
         Message.LOG_ERROR.send(console, s);
     }
 }