[2.x] Add remember session option

[miguilimzero]

• This pull request will add a config option in order to th developer enable remember option to socialstream sessions.

[miguilimzero]

I also think that would be better if the env config get changed from 'SHOW_SOCIALSTREAM' to 'SOCIALSTREAM_DISPLAY' (or SOCIALSTREAM_SHOW), since the .env parameters always follow THETHING_THEPARAMETER format.

[joelbutcher]

I also think that would be better if the env config get changed from 'SHOW_SOCIALSTREAM' to 'SOCIALSTREAM_DISPLAY' (or SOCIALSTREAM_SHOW), since the .env parameters always follow THETHING_THEPARAMETER format.

@SrDante I agree with the format here. However, considering this would introduce a breaking change for those currently using 2.x, can you send this into master please?

[miguilimzero]

I think that changing the env from SHOW_SOCIALSTREAM to SOCIALSTREAM_SHOW would not cause any break changes, since the configuration file would not be changed in published projects.