### export only class GeneralOptions

      properties
            verboseLevel = 1
            warningLevel = 1
            comments = 1   // 0=>no comments, 1=>source line & source comments 2=>add "compiled by..."

            #ifdef PROD_C
            target ="c"
            outDir = 'generated/c'
            #else
            target ="js"
            outDir = 'generated/js'
            #end if

            debugEnabled = undefined
            perf=0 // performace counters 0..2
            skip = undefined
            generateSourceMap = true //default is to generate sourcemaps
            single = undefined
            compileIfNewer = undefined //compile only if source is newer
            browser =undefined //compile js for browser environment (instead of node.js env.)
            es6: boolean //compile to js-EcmaScript6

            defines: array of string = []
            includeDirs: array of string = []

            projectDir:string = '.'
            mainModuleName:string = 'unnamed'

            storeMessages: boolean = false

            //literalMap: string // produce "new Class().fromObject({})" on "{}"" instead of a js object
            // activate with: 'lexer options object literal is Foo'. A class is required to produce C-code 

            version: string

            now: Date = new Date()

      method toString
            return """
                outDir:#{.outDir}
                defines:#{.defines.join()}
                """