add option to blacklist msg from the searched msg

[antiwinter]

Hi, I dug into this addon a bit and didn't find to way to remove some message from what has been searched out. For example, there are many flight companies posting message:

[5][Someone]: ★★★★【stsm后門3g】★★★★【stsm后門3g】★★★★【斯坦索姆后門3g】★★★★【stsm后門3g】★★★★【stsm后門3g】★★★★【斯坦索姆后門3g】★★★★
[5][Someone]: ★★★★【stsm后門3g】★★★★【stsm后門3g】★★★★【斯坦索姆后門3g】★★★★【stsm后門3g】★★★★【stsm后門3g】★★★★【斯坦索姆后門3g】★★★★
[5][Someone]: ★★★★【stsm后門3g】★★★★【stsm后門3g】★★★★【斯坦索姆后門3g】★★★★【stsm后門3g】★★★★【stsm后門3g】★★★★【斯坦索姆后門3g】★★★★

If I want to go to strathome and search the keyword STSM, these rubbish messages will be printed.

So I've had an option to remove some message by keywords STSM,-3G from what has been searched out. The minus indicates the keyword you don't want to see.