[kutil] Add sorted insert to kutil::vector

Added a sorted insert to vector, as well as cleaning up and extending
the removal functions.

src/tests/vector.cpp

@@ -0,0 +1,25 @@
+#include <vector>
+#include "kutil/vector.h"
+#include "catch.hpp"
+#include "container_helpers.h"
+
+TEST_CASE( "sorted vector tests", "[containers] [vector]" )
+{
+	using clock = std::chrono::system_clock;
+	unsigned seed = clock::now().time_since_epoch().count();
+	std::default_random_engine rng(seed);
+	std::uniform_int_distribution<int> distrib(0,10000);
+
+	kutil::vector<sortableT> v;
+
+	int sizes[] = {1, 2, 3, 5, 100};
+	for (int s : sizes) {
+		for (int i = 0; i < s; ++i) {
+			sortableT t { distrib(rng) };
+			v.sorted_insert(t);
+		}
+
+		for (int i = 1; i < s; ++i)
+			CHECK( v[i].value >= v[i-1].value );
+	}
+}