new in this commit:
- rounded corners everywhere! cobalt is now safe for everyone who can't handle sharp objects.
- proper banner loading. no more jumping text!
- proper banner error handling. if banner wasn't loaded, it'll simply go grey instead of disappearing.
- links are no longer italic and are instead underlined.
- collapsible lists now have corresponding emoji.
- donate button is now highlighted with magenta instead of white.
- added a list of keyboard shortcuts to about tab.
- centered old changelog loader.
- page render caching
- onDemand block caching
- page html minify
- better rate limiting
- minor cobalt.js clean up
- page render platform indication in settings popup
all these changes are aimed to improve performance and responsiveness
!! not final version of 5.2 !!
