EqualityCheck extracted and used in various inspections, other fixes

EqualsCalledOnEnumValueFix replaced with EqualsToEqualityFix which does the same

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/bigDecimalEquals/afterBigDecimalEquals.java

@@ -0,0 +1,22 @@
+// "Fix all ''equals()' called on 'java.math.BigDecimal'' problems in file" "true"
+import java.math.BigDecimal;
+import java.util.Objects;
+
+class BigDecimalEquals {
+  public void foo(BigDecimal qux)
+  {
+    final BigDecimal foo = new BigDecimal(3);
+    final BigDecimal bar = new BigDecimal(3);
+    foo.equals(bar);
+    if(foo.compareTo(bar) == 0)
+    {
+      return;
+    }
+    if(!(foo.compareTo(bar) == 0)) {
+      System.out.println("not equals");
+    }
+    if(qux != null && qux.compareTo(bar) == 0) {
+      System.out.println("equals");
+    }
+  }
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/bigDecimalEquals/beforeBigDecimalEquals.java

@@ -0,0 +1,22 @@
+// "Fix all ''equals()' called on 'java.math.BigDecimal'' problems in file" "true"
+import java.math.BigDecimal;
+import java.util.Objects;
+
+class BigDecimalEquals {
+  public void foo(BigDecimal qux)
+  {
+    final BigDecimal foo = new BigDecimal(3);
+    final BigDecimal bar = new BigDecimal(3);
+    foo.equals(bar);
+    if(foo.eq<caret>uals(bar))
+    {
+      return;
+    }
+    if(!Objects.equals(foo, bar)) {
+      System.out.println("not equals");
+    }
+    if(Objects.equals(qux, bar)) {
+      System.out.println("equals");
+    }
+  }
+}