added compress_options to sekizai postprocessor

[CaptainChaos]

Hi guys,
after I cancelled my last PR (#1023) due to missing features, I now added an improved way to configure the sekizai postprocessor. Specifically, I missed a way to

• compress custom-named blocks, since the old postprocessor only supported the names "js" and "css"
• generate preload or inline compress blocks

My idea was that a sekizai block can now contain an html comment <!-- compress_options [params] -->, where [params] can be

• one of "js" or "css"
• one or multiple of "file", "preload" and "inline"

If the comment is missing, the behavior of the postprocessor doesn't change. This way, I can for example include <!-- compress_options css file preload --> in my css sekizai block (with {% addtoblock "css" %}), and the postprocessor generates a compressed file and also the correct preload link.

If I should change anything, let me know.

Best regards!

[CaptainChaos]

I added a defer option for scripts, because sometimes this makes sense for page speed optimizations

[karyon]

Hi! sorry for the late reply. is this params-in-html-comments a thing in sekizai? if yes that's fine, otherwise it appears too hacky to me to include it. Unfortunately I don't know sekizai at all so I can't give any design recommendations.