Composer compatibility and performance improvements

PitaJ

Last night, took a look at the composer and improved the performance substantially. I also changed the positioning to use top instead of translate for better compatibility.

NodeBB/nodebb-plugin-composer-default#12

Also, just want to remind you of my other PRs, NodeBB/nodebb-theme-persona#171 and NodeBB/NodeBB#3769

julian

Thank you for the reminders Helps us keep on top of things!

exodo

good job

PitaJ

More changes here, there's now NodeBB/NodeBB#3807, which replaces utils.findBootstrapEnvironment to make it much faster. Also made another branch with-css which uses CSS for the .write-preview-container positioning.