Huge performance update for subscriber list in streams.
Huge performance update for subscriber list in streams.

Previously the mechanism worked such that the innerHTML was being
appended to directly potentially thousands of times which has horrific
performance implications. By concating all the strings together before
appending to the HTML it all gets rendered in one chunk without forcing
a re-render of previous elements. Performance is ~15x-20x faster now.

mahim97/zulip,PhilSk/zulip,souravbadami/zulip,dattatreya303/zulip,timabbott/zulip,dawran6/zulip,synicalsyntax/zulip,j831/zulip,brockwhittaker/zulip,samatdav/zulip,andersk/zulip,SmartPeople/zulip,souravbadami/zulip,j831/zulip,zulip/zulip,vabs22/zulip,susansls/zulip,souravbadami/zulip,brockwhittaker/zulip,jainayush975/zulip,mahim97/zulip,vaidap/zulip,dhcrzf/zulip,timabbott/zulip,susansls/zulip,punchagan/zulip,brockwhittaker/zulip,hackerkid/zulip,shubhamdhama/zulip,j831/zulip,christi3k/zulip,susansls/zulip,rht/zulip,kou/zulip,jainayush975/zulip,hackerkid/zulip,hackerkid/zulip,jackrzhang/zulip,amanharitsh123/zulip,blaze225/zulip,rishig/zulip,verma-varsha/zulip,dattatreya303/zulip,jackrzhang/zulip,shubhamdhama/zulip,aakash-cr7/zulip,samatdav/zulip,brainwane/zulip,rht/zulip,ryanbackman/zulip,andersk/zulip,christi3k/zulip,dawran6/zulip,brainwane/zulip,jrowan/zulip,eeshangarg/zulip,synicalsyntax/zulip,eeshangarg/zulip,brockwhittaker/zulip,amanharitsh123/zulip,JPJPJPOPOP/zulip,eeshangarg/zulip,aakash-cr7/zulip,souravbadami/zulip,vabs22/zulip,SmartPeople/zulip,SmartPeople/zulip,timabbott/zulip,dattatreya303/zulip,rishig/zulip,tommyip/zulip,synicalsyntax/zulip,JPJPJPOPOP/zulip,amanharitsh123/zulip,rishig/zulip,dawran6/zulip,punchagan/zulip,jphilipsen05/zulip,jainayush975/zulip,jrowan/zulip,andersk/zulip,tommyip/zulip,synicalsyntax/zulip,ryanbackman/zulip,blaze225/zulip,kou/zulip,andersk/zulip,shubhamdhama/zulip,hackerkid/zulip,shubhamdhama/zulip,aakash-cr7/zulip,hackerkid/zulip,punchagan/zulip,jackrzhang/zulip,vabs22/zulip,SmartPeople/zulip,mahim97/zulip,synicalsyntax/zulip,jphilipsen05/zulip,Galexrt/zulip,jackrzhang/zulip,jrowan/zulip,Galexrt/zulip,samatdav/zulip,christi3k/zulip,eeshangarg/zulip,dhcrzf/zulip,kou/zulip,rht/zulip,jphilipsen05/zulip,christi3k/zulip,ryanbackman/zulip,Galexrt/zulip,showell/zulip,showell/zulip,vabs22/zulip,j831/zulip,dhcrzf/zulip,dattatreya303/zulip,amanharitsh123/zulip,andersk/zulip,j831/zulip,jackrzhang/zulip,rishig/zulip,ryanbackman/zulip,rishig/zulip,Galexrt/zulip,kou/zulip,brainwane/zulip,jainayush975/zulip,rht/zulip,jainayush975/zulip,brainwane/zulip,susansls/zulip,punchagan/zulip,samatdav/zulip,dhcrzf/zulip,tommyip/zulip,dawran6/zulip,Galexrt/zulip,timabbott/zulip,verma-varsha/zulip,dhcrzf/zulip,jphilipsen05/zulip,aakash-cr7/zulip,punchagan/zulip,vabs22/zulip,dawran6/zulip,Galexrt/zulip,zulip/zulip,blaze225/zulip,kou/zulip,eeshangarg/zulip,tommyip/zulip,zulip/zulip,tommyip/zulip,jackrzhang/zulip,PhilSk/zulip,shubhamdhama/zulip,vabs22/zulip,showell/zulip,jphilipsen05/zulip,souravbadami/zulip,dawran6/zulip,zulip/zulip,jainayush975/zulip,kou/zulip,tommyip/zulip,timabbott/zulip,blaze225/zulip,samatdav/zulip,PhilSk/zulip,showell/zulip,brainwane/zulip,punchagan/zulip,brainwane/zulip,eeshangarg/zulip,mahim97/zulip,zulip/zulip,brockwhittaker/zulip,verma-varsha/zulip,timabbott/zulip,JPJPJPOPOP/zulip,brockwhittaker/zulip,jrowan/zulip,showell/zulip,SmartPeople/zulip,jrowan/zulip,susansls/zulip,hackerkid/zulip,rishig/zulip,vaidap/zulip,verma-varsha/zulip,dhcrzf/zulip,mahim97/zulip,eeshangarg/zulip,hackerkid/zulip,jrowan/zulip,rht/zulip,SmartPeople/zulip,rht/zulip,dattatreya303/zulip,j831/zulip,aakash-cr7/zulip,vaidap/zulip,shubhamdhama/zulip,zulip/zulip,jphilipsen05/zulip,rishig/zulip,showell/zulip,vaidap/zulip,vaidap/zulip,punchagan/zulip,Galexrt/zulip,zulip/zulip,jackrzhang/zulip,ryanbackman/zulip,verma-varsha/zulip,mahim97/zulip,tommyip/zulip,susansls/zulip,andersk/zulip,PhilSk/zulip,PhilSk/zulip,kou/zulip,samatdav/zulip,shubhamdhama/zulip,blaze225/zulip,timabbott/zulip,synicalsyntax/zulip,verma-varsha/zulip,rht/zulip,showell/zulip,christi3k/zulip,dattatreya303/zulip,amanharitsh123/zulip,brainwane/zulip,christi3k/zulip,JPJPJPOPOP/zulip,ryanbackman/zulip,dhcrzf/zulip,JPJPJPOPOP/zulip,JPJPJPOPOP/zulip,synicalsyntax/zulip,PhilSk/zulip,amanharitsh123/zulip,andersk/zulip,blaze225/zulip,aakash-cr7/zulip,souravbadami/zulip,vaidap/zulip