Added new kind of test: check for specific properties of AST

test/libsolidity/astPropertyTests/blank_test_case.sol

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+/// TestCase1: name
+contract C {
+    ///
+    ///
+    function f() public pure { }
+}
+// ----
+// TestCase1: C
+//

test/libsolidity/astPropertyTests/multiple_nested_properties_per_node.sol

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+contract C {
+    function f() public pure {
+        /// TestCase1: condition.operator
+        /// TestCase2: initializationExpression.initialValue.value
+        /// TestCase3: loopExpression.expression.subExpression.name
+        for(uint i = 1; i < 42; i++) {
+        }
+    }
+}
+// ----
+// TestCase1: <
+// TestCase2: 1
+// TestCase3: i

test/libsolidity/astPropertyTests/multiple_properties_per_node.sol

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+contract C {
+    /// TestCase1: name
+    /// TestCase2: functionSelector
+    /// TestCase3: visibility
+    function singleFunction() public pure {
+    }
+}
+// ----
+// TestCase1: singleFunction
+// TestCase2: 3d33252c
+// TestCase3: public

test/libsolidity/astPropertyTests/nested_properties.sol

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+contract C {
+    function f() public pure {
+        /// TestCase1: condition.operator
+        for(uint i = 0; i < 42; ++i) {
+        }
+        /// TestCase2: initializationExpression.initialValue.value
+        for(uint i = 1; i < 42; i = i * 2) {
+        }
+        /// TestCase3: loopExpression.expression.subExpression.name
+        for(uint i = 0; i < 42; i++) {
+        }
+    }
+}
+// ----
+// TestCase1: <
+// TestCase2: 1
+// TestCase3: i

test/libsolidity/astPropertyTests/property_expectation_with_colon.sol

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+/// TestCase1: nameLocation
+/// TestCase2: src
+contract C {
+    function f() public pure {
+    }
+}
+// ----
+// TestCase1: 115:1:-1
+// TestCase2: 106:51:-1

test/libsolidity/astPropertyTests/simple_properties.sol

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+/// TestContractC: name
+contract C {
+    /// TestStateVarX: stateVariable
+    uint x;
+    /// TestFunctionF: visibility
+    function f() public pure {
+    }
+}
+// ----
+// TestContractC: C
+// TestStateVarX: true
+// TestFunctionF: public