Replace ciCompareLen with ciStartsWith where possible

`ciCompareLen(a, b, b.size()) == 0` expression is an equivalent of checking for
equality of `a` prefix with size `b.size()` with `b`.

`ciCompareLen(a, b, a.size()) == 0` is also the same thing but `a` is a prefix
`b` should start with.

components/misc/strings/algorithm.hpp

@@ -28,6 +28,11 @@ namespace Misc::StringUtils
                           [] (char l, char r) { return toLower(l) == toLower(r); });
     }
 
+    inline bool ciStartsWith(std::string_view value, std::string_view prefix)
+    {
+        return ciEqual(value.substr(0, prefix.size()), prefix);
+    }
+
     inline int ciCompareLen(std::string_view x, std::string_view y, std::size_t len)
     {
         std::string_view::const_iterator xit = x.begin();