Public utility to detect read/write access for an expression

Implemented ReadWriteAccessDetector which gives read/write access in Highlight Usages and Find Usages
+ More correct UsageType detection

idea/testData/findUsages/kotlin/variable/readAccess.0.kt

@@ -0,0 +1,13 @@
+// PSI_ELEMENT: org.jetbrains.kotlin.psi.JetProperty
+// OPTIONS: usages
+// OPTIONS: skipWrite
+fun foo() {
+    var <caret>v = 1
+    v = 2
+    print(v)
+    ++v
+    v--
+    print(-v)
+    v += 1
+    v -= 1
+}

idea/testData/findUsages/kotlin/variable/readAccess.results.txt

@@ -0,0 +1,6 @@
+Value read (10: 12) print(-v)
+Value read (7: 11) print(v)
+Value write (11: 5) v += 1
+Value write (12: 5) v -= 1
+Value write (8: 7) ++v
+Value write (9: 5) v--

idea/testData/findUsages/kotlin/variable/writeAccess.0.kt

@@ -0,0 +1,13 @@
+// PSI_ELEMENT: org.jetbrains.kotlin.psi.JetProperty
+// OPTIONS: usages
+// OPTIONS: skipRead
+fun foo() {
+    var <caret>v = 1
+    v = 2
+    print(v)
+    ++v
+    v--
+    print(-v)
+    v += 1
+    v -= 1
+}

idea/testData/findUsages/kotlin/variable/writeAccess.results.txt

@@ -0,0 +1,5 @@
+Value write (11: 5) v += 1
+Value write (12: 5) v -= 1
+Value write (6: 5) v = 2
+Value write (8: 7) ++v
+Value write (9: 5) v--