Smart completion: prefer items matching by name

idea/testData/completion/weighers/basic/PropertiesBeforeKeywords.kt

@@ -0,0 +1,19 @@
+val br1 = 11
+
+fun br() = 111
+
+class Test(val br2 = 12) {
+    val br3 = 13
+
+    fun brf() = 112
+
+    fun test(br4: Int) {
+        val br5 = 14
+        br<caret>
+    }
+}
+
+// "br" function is before other elements because of exact prefix match
+
+// ORDER: br, br4, br5, br1, br2, br3, break, brf
+// SELECTED: 0