Allow to apply $removeparam rules to all resources

[Alex-302]

AdguardTeam/tsurlfilter#16

• another sample
  AdguardTeam/AdguardFilters@d24a901

[ameshkov]

@sfionov moved it to 1.8. Please note that the documentation needs to be updated accordingly.

Re-posting from the tsurlfilter repo:

I suppose we should only allow it to target other content types if the rule has an explicit content-type modifier.

By default it should only target documents.