Extract EditorResourceConversionPlugin into its own source files and clean up editor includes

modules/gdscript/language_server/gdscript_language_protocol.cpp

@@ -34,6 +34,7 @@
 #include "editor/doc_tools.h"
 #include "editor/editor_log.h"
 #include "editor/editor_node.h"
+#include "editor/editor_settings.h"
 
 GDScriptLanguageProtocol *GDScriptLanguageProtocol::singleton = nullptr;
 

modules/gdscript/language_server/gdscript_language_server.cpp

@@ -34,6 +34,7 @@
 #include "core/os/os.h"
 #include "editor/editor_log.h"
 #include "editor/editor_node.h"
+#include "editor/editor_settings.h"
 
 GDScriptLanguageServer::GDScriptLanguageServer() {
 	_EDITOR_DEF("network/language_server/remote_host", host);

modules/gdscript/language_server/gdscript_workspace.cpp

@@ -38,6 +38,7 @@
 #include "editor/editor_file_system.h"
 #include "editor/editor_help.h"
 #include "editor/editor_node.h"
+#include "editor/editor_settings.h"
 #include "gdscript_language_protocol.h"
 #include "scene/resources/packed_scene.h"