Fixes a bunch of saycode things. Objs can now hear radio talk.
Added a proper strip_html() function.
Fixed #4959
Merge branch 'master' of https://github.com/tgstation/-tg-station into 420

Conflicts:
	code/modules/admin/admin_verbs.dm
Merge pull request #4988 from Miauw62/420

Fixes a bunch of saycode things.