`std.algorithm.searching.skipOver` can now handle variadic arguments

$(REF skipOver, std,algorithm) which allows to move over a needle if it matches
now accepts variadic arguments for needles to skip over:

---
auto s = "DLang.rocks";
assert(!s.skipOver("dlang", "DLF", "DLang "));
assert(s == "DLang.rocks");

assert(s.skipOver("dlang", "DLANG", "DLF", "D", "DL", "DLanp"));
assert(s == "ang.rocks");
---
