KT-4568 Bug Fix: Refactored the convertNegatedExpressionWithDemorgansLaw intention to better handle longer and more complex expressions. Fixed bug and added appropriate test cases as well.

idea/testData/intentions/convertNegatedExpressionWithDemorgansLaw/complexNegation1.kt

@@ -0,0 +1,3 @@
+fun foo(a: Boolean, c: Int, d: Int) : Boolean {
+    return !(a <caret>&& c == d)
+}

idea/testData/intentions/convertNegatedExpressionWithDemorgansLaw/complexNegation1.kt.after

@@ -0,0 +1,3 @@
+fun foo(a: Boolean, c: Int, d: Int) : Boolean {
+    return !a || !(c == d)
+}

idea/testData/intentions/convertNegatedExpressionWithDemorgansLaw/complexNegation2.kt

@@ -0,0 +1,3 @@
+fun foo(a: Int, b: Int, c: Int, d: Int) : Boolean {
+    return !(a < b && c ==<caret> d && a < d)
+}

idea/testData/intentions/convertNegatedExpressionWithDemorgansLaw/complexNegation2.kt.after

@@ -0,0 +1,3 @@
+fun foo(a: Int, b: Int, c: Int, d: Int) : Boolean {
+    return !(a < b) || !(c == d) || !(a < d)
+}