we should drain timer before reset it

According to https://antonz.org/timer-reset

fix iframe OOPIF issue

Resolve #548

Feat: Add the PagePool.TryGet method while it returns an error for pr…

…ocessing. (#1051)

* PagePool add TryGet to deal error that Page() returns.

* modify tryget

* Add BrowserPool TryGet test

* test coverage

* go fmt

* go fmt

* pool.Get -> pool.MustGet; pool.Get allow error

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Co-authored-by: bestmountain <zxcltj@foxmail.com>

fix: shouldn't reset the user preferences by default

Resolve #1041

fix lint issues

doc

fix test

should use the same host as the input

fix #972

disable the pdf viewer by default

add InputColor (#919)