asyncdispatch on RTOS(Flat Memory)

[takekikuchi]

I tried splitting it into multiple commands (functions), but the Nim 
definitions seemed to be duplicated when linking.
    
    
    multiple definition of `parseStandardFormatSpecifier__ pureZstrformat_u56'
    multiple definition of `nim_program_result';
    
    
    Run

With RTOS, it seems difficult to have multiple Nim programs coexist because 
they are linked to a single binary.