Updated interface for group chats

[imbinit17]

1. Group Chats Viewing Ability
2. Profile Pictures for other participants (except you i.e sender)

For more details , refer README

[imbinit17]

Updated repo from last PR with added support for export of images and videos .

Scope for Improvement : PDF files

[imbinit17]

Optimized the code to reduce the time taken and memory usage greatly

Earlier , the script took great time (30 mins) and many a times the browser crashed for large chat history (10k messages) as the script was replacing the entire innerHTML for every new message encountered when parsing . This took a lot of time ,memory and computing power .

With appending newHTML elements , this time has greatly reduced to display 10k messages within few seconds .

[imbinit17]

Now one can view :

1. All people in the conversation at once (though it makes sense for group chats only)
2. All media in the conversation at once (jpg,jpeg,png,gif,mp4,etc)
3. All links in the conversation at once

Media & Link will also carry attribute for date & time along with them .