a lot of changes and improvements

src/commonMain/kotlin/KSLoggerDefaultPlatformLoggerLambdaExpect.kt

@@ -0,0 +1,7 @@
+package dev.inmo.kslog.common
+
+/**
+ * Default logger for current platform. You may change it, but you should remember that it is global logger
+ * used in [KSLog.default] by default
+ */
+expect var KSLoggerDefaultPlatformLoggerLambda: (level: LogLevel, tag: String, message: Any, throwable: Throwable?) -> Unit