feature: SimpleLogger class implementation

- add SimpleLogger class
- add LogLevel enum and current_log_level which serve to show only logs with level > to it
- add trace, debug, info, warning, error functions and their abbreviate form
- add _print function which is in charge to print the message
- the message can have timestamp and type being showed before the message [<type>  ][<timestamp>]: <message>
- add the possibility to let specify a file where to save the file in append mode

logger.gd

@@ -0,0 +1,108 @@
+class_name SimpleLogger extends Node
+
+
+enum LogLevel {
+	TRACE,
+	DEBUG,
+	INFO,
+	WARN,
+	ERROR
+}
+
+
+@export var current_log_level:LogLevel = LogLevel.DEBUG
+@export var enable_timestamp:bool = true
+@export var save_log:bool = false
+@export var folder:String = ""
+@export var log_filename:String = "addons/Logs/data.log"
+
+const TIMESTAMP_FORMAT:String = "%H:%M:%S"
+const LOG_FORMAT_TIMESTAMP:String = "[%s]|[%-6s]: %s"
+const LOG_FORMAT:String = "[%-6s]: %s"
+
+var log_file_path = folder + log_filename
+
+
+#region Logger main stuff
+
+func _print(level: LogLevel, ...args: Array) -> void:
+	if level < current_log_level: return
+	
+	var level_str:String = LogLevel.keys()[level]
+	var timestamp := Time.get_time_string_from_system()
+	var text: String = ""
+	for arg:Variant in args: 
+		for arg2 in arg:
+			text += str(arg2)
+
+	var message:String = LOG_FORMAT_TIMESTAMP % [
+		timestamp,
+		level_str,
+		text,
+	] if self.enable_timestamp else LOG_FORMAT % [
+		level_str,
+		text,
+	]
+
+	match level:
+		LogLevel.ERROR: push_error(message)
+		LogLevel.WARN: push_warning(message)
+		_: print(message)
+
+	if self.save_log: self._save_logs_to_file(message)
+
+
+func _save_logs_to_file(message: String) -> bool:
+	var file := FileAccess.open(self.log_file_path, FileAccess.READ_WRITE)
+	if file == null:
+		DirAccess.make_dir_recursive_absolute(self.folder)
+		var tmp_file = FileAccess.open(self.log_file_path, FileAccess.WRITE)
+		if tmp_file == null:
+			push_error("Failed to create file %s" % self.log_file_path)
+			return false
+		file = tmp_file
+	file.seek_end()
+	file.store_line(message)
+	return true
+
+#endregion
+
+
+#region level functions
+
+func trace(...args: Array) -> void:
+	_print(LogLevel.TRACE, args)
+
+func debug(...args: Array) -> void:
+	_print(LogLevel.DEBUG, args)
+
+func info(...args: Array) -> void:
+	_print(LogLevel.INFO, args)
+
+func warning(...args: Array) -> void:
+	_print(LogLevel.WARN, args)
+
+func error(...args: Array) -> void:
+	_print(LogLevel.ERROR, args)
+
+#endregion
+
+
+#region abbreviated functions
+
+func t(...args: Array) -> void:
+	_print(LogLevel.TRACE, args)
+
+func d(...args: Array) -> void:
+	_print(LogLevel.DEBUG, args)
+
+func i(...args: Array) -> void:
+	_print(LogLevel.INFO, args)
+
+func w(...args: Array) -> void:
+	_print(LogLevel.WARN, args)
+
+func e(...args: Array) -> void:
+	_print(LogLevel.ERROR, args)
+
+#endregion