Improved word selection for parameters and arguments.

#KT-1657 fixed

idea/testData/wordSelection/TypeArguments.1.kt

@@ -0,0 +1,3 @@
+fun <A, B> foo() {
+    foo<<selection>I<caret>nt, B</selection>>()
+}

idea/testData/wordSelection/TypeArguments.kt

@@ -0,0 +1,3 @@
+fun <A, B> foo() {
+    foo<<selection>I<caret>nt</selection>, B>()
+}

idea/testData/wordSelection/TypeParameters.1.kt

@@ -0,0 +1,2 @@
+fun <<selection>A, <caret>B</selection>> foo() {
+}

idea/testData/wordSelection/TypeParameters.kt

@@ -0,0 +1,2 @@
+fun <A, <selection><caret>B</selection>> foo() {
+}

idea/testData/wordSelection/ValueArguments.1.kt

@@ -0,0 +1,3 @@
+fun foo() {
+    foo(<selection><caret>1, 2</selection>)
+}

idea/testData/wordSelection/ValueArguments.kt

@@ -0,0 +1,3 @@
+fun foo() {
+    foo(<selection><caret>1</selection>, 2)
+}

idea/testData/wordSelection/ValueParameters.1.kt

@@ -0,0 +1,2 @@
+fun foo(<selection>a : Array<String>, <caret>b : Int</selection>) {
+}

idea/testData/wordSelection/ValueParameters.kt

@@ -0,0 +1,2 @@
+fun foo(a : Array<String>, <selection><caret>b : Int</selection>) {
+}