Internal filters conversion

[ameshkov]

• Scriptlets/snippets conversion (don't forget about converting #@#+js).
• Convert :style uBO rules to #$#.
• Convert ##^script:has-text to $$script[tag-containts]
• inline-script -- the same as csp=script-src 'self' 'unsafe-eval' http: https: data: blob: mediastream: filesystem:
• inline-font -- the same as csp=font-src 'self' 'unsafe-eval' http: https: data: blob: mediastream: filesystem:

[sxgunchenko]

core/pull-requests/1459