logic: Follow symbolic links to directoris within source paths

* Follow symbolic links to files and references by default now
* Fixed crash on self-referencing symbolic links

bug id = 205

bin/test/data/FileSystemTestSuite/src/Settings

@@ -0,0 +1 @@
+../Settings

bin/test/data/FileSystemTestSuite/src/main.cpp

@@ -0,0 +1 @@
+../main.cpp

bin/test/data/FileSystemTestSuite/src/self

@@ -0,0 +1 @@
+self

bin/test/data/FileSystemTestSuite/src/test.cpp

@@ -0,0 +1,4 @@
+void test()
+{
+
+}

bin/test/data/FileSystemTestSuite/src/test.h

@@ -0,0 +1,4 @@
+class Test
+{
+
+};