Roadmap Release 5.3.0

[totocaca123]

Due to numbers of features pending, it would be good for the next releases to focus priority topics.

From my usage of this plugin, following tickets are crittical:

#107

For multi level (tab feature like in warning next gen plugin):

#54

For ticket #79 , it is an interresting one for people using excel format (to avoid separator problems). But I don't know if there is a library to manage xls/xlsx files