Support regular expression-based network filters

[gorhill]

Just a placeholder for the future if I ever decide to support these, and to act as an entry for information purpose.

At time of writing, there are currently only 16 such filters in EasyList out of which is 45,000+ lines.

[gorhill]

Stock uBlock with support for regex-based filters:

µBlock> onBeforeRequest: 0.118 ms (9726 samples)
µBlock> onBeforeRequest: 0.118 ms (9827 samples)
µBlock> onBeforeRequest: 0.118 ms (9903 samples)
µBlock> onBeforeRequest: 0.118 ms (9980 samples)
µBlock> onBeforeRequest: 0.118 ms (10066 samples)
µBlock> onBeforeRequest: 0.118 ms (10157 samples)
µBlock> onBeforeRequest: 0.118 ms (10322 samples)
µBlock> onBeforeRequest: 0.118 ms (10336 samples)
µBlock> onBeforeRequest: 0.118 ms (10517 samples)
µBlock> onBeforeRequest: 0.118 ms (10569 samples)

[gorhill]

µBlock> onBeforeRequest: 0.112 ms (8508 samples)
µBlock> onBeforeRequest: 0.112 ms (8516 samples)
µBlock> onBeforeRequest: 0.112 ms (8589 samples)
µBlock> onBeforeRequest: 0.112 ms (8652 samples)
µBlock> onBeforeRequest: 0.112 ms (8708 samples)
µBlock> onBeforeRequest: 0.112 ms (8783 samples)
µBlock> onBeforeRequest: 0.112 ms (8861 samples)
µBlock> onBeforeRequest: 0.112 ms (8915 samples)
µBlock> onBeforeRequest: 0.111 ms (9077 samples)
µBlock> onBeforeRequest: 0.111 ms (9091 samples)