Settings improvements

[buger]

There is few issues i want to fix:

• I do not like that we have lot of setting_* files in root directory, lot of them can be merged together
• Improve flag names, make it more consistent and predictable.
• With Send unmodified http request #160 merged, filter/rewriting operations now applied to any output, not only http. We should update documentation.
• There is lack of URL params filtering/rewriting
• Add --http-disallow-url option. Should fix A way to not replay certain requests when they match a pattern - blacklist #134
• Use percent based numbers in hash filters
• Hash filters should not reject urls if param/header not matched. To mimic this functionality use second --http-allow-header filter
• Allow multiple url filters