Introduce a new arguments parser (#1629)

Original commits:

* Clean-up

* Introduce a new application arguments parser & handler

* Clean-up and deprecate `Tools#getLanguageOption`

* Fix `-debug` and `-debugall` parameters

* found this while debugging, ...why

* Remove deprecated parameters

* Invoke startup argument parser before handbook generation

* Move command map instantiation to `Grasscutter `(prevent making 3 instances on startup)

* Ensure \n at EOF

Co-authored-by: AnimeGitB <AnimeGitB@bigblueball.in>

src/main/java/emu/grasscutter/server/game/GameServer.java

@@ -72,7 +72,6 @@ public final class GameServer extends KcpServer {
 
     // Extra
     private final ServerTaskScheduler scheduler;
-    private final CommandMap commandMap;
     private final TaskMap taskMap;
 
     private ChatManagerHandler chatManager;
@@ -107,7 +106,6 @@ public final class GameServer extends KcpServer {
 
         // Extra
         this.scheduler = new ServerTaskScheduler();
-        this.commandMap = new CommandMap(true);
         this.taskMap = new TaskMap(true);
 
         // Create game systems

src/main/java/emu/grasscutter/server/http/documentation/HandbookRequestHandler.java

@@ -54,7 +54,7 @@ final class HandbookRequestHandler implements DocumentationHandler {
             sbs.add(new StringBuilder(""));
 
         // Commands table
-        new CommandMap(true).getHandlersAsList().forEach(cmd -> {
+        CommandMap.getInstance().getHandlersAsList().forEach(cmd -> {
             String label = cmd.getLabel();
             String descKey = cmd.getDescriptionKey();
             for (int langIdx = 0; langIdx < NUM_LANGUAGES; langIdx++)