Removed console legacy color support (#1105)

Co-authored-by: Shane Freeder <1228900+electronicboy@users.noreply.github.com>

proxy/log4j2-plugin/build.gradle.kts

@@ -0,0 +1,4 @@
+dependencies {
+    implementation(libs.bundles.log4j)
+    annotationProcessor(libs.log4j.core)
+}

proxy/log4j2-plugin/src/main/java/com/velocitypowered/proxy/util/StripAnsiConverter.java

@@ -0,0 +1,80 @@
+/*
+ * Copyright (C) 2023 Velocity Contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.velocitypowered.proxy.util;
+
+import java.util.List;
+import java.util.regex.Pattern;
+import org.apache.logging.log4j.core.LogEvent;
+import org.apache.logging.log4j.core.config.Configuration;
+import org.apache.logging.log4j.core.config.plugins.Plugin;
+import org.apache.logging.log4j.core.layout.PatternLayout;
+import org.apache.logging.log4j.core.pattern.ConverterKeys;
+import org.apache.logging.log4j.core.pattern.LogEventPatternConverter;
+import org.apache.logging.log4j.core.pattern.PatternConverter;
+import org.apache.logging.log4j.core.pattern.PatternFormatter;
+import org.apache.logging.log4j.core.pattern.PatternParser;
+
+/**
+ * Strip Format Converter.
+ * Based on <a href="https://github.com/PaperMC/Paper/pull/9313/files#diff-6c1396d60730e7053f0b761bdb487752467c9bc0444a4aac41908376b38a56bdR198-R233">Paper's patch</a>
+ */
+@Plugin(name = "stripAnsi", category = PatternConverter.CATEGORY)
+@ConverterKeys("stripAnsi")
+public class StripAnsiConverter extends LogEventPatternConverter {
+  private static final Pattern ANSI_PATTERN = Pattern.compile("\u001B\\[[;\\d]*m");
+  private final List<PatternFormatter> formatters;
+
+  /**
+   * Constructs an instance of StripAnsiConverter.
+   */
+  protected StripAnsiConverter(List<PatternFormatter> formatters) {
+    super("stripAnsi", null);
+    this.formatters = formatters;
+  }
+
+  @Override
+  public void format(final LogEvent event, final StringBuilder toAppendTo) {
+    int start = toAppendTo.length();
+    for (final PatternFormatter formatter : formatters) {
+      formatter.format(event, toAppendTo);
+    }
+    String content = toAppendTo.substring(start);
+    content = ANSI_PATTERN.matcher(content).replaceAll("");
+
+    toAppendTo.setLength(start);
+    toAppendTo.append(content);
+  }
+
+  /**
+   * Creates a new Instance of this Converter.
+   *
+   * @param config the configuration
+   * @param options the options
+   * @return a new instance
+   */
+  public static StripAnsiConverter newInstance(Configuration config, String[] options) {
+    if (options.length != 1) {
+      LOGGER.error("Incorrect number of options on stripFormat. Expected 1 received "
+              + options.length);
+      return null;
+    }
+    PatternParser parser = PatternLayout.createPatternParser(config);
+    List<PatternFormatter> formatters = parser.parse(options[0]);
+    return new StripAnsiConverter(formatters);
+  }
+}