Locator: Add camel hump locator filter for C++, QML, and files

* Use the CamelHumpMatcher in the C++, QML, and files filters
* Supports matching against UpperCamelCase, lowerCamelCase
  and snake_case strings
* Supports highlighting of matched characters

Task-number: QTCREATORBUG-3111
Started-by: David Kaspar <dkaspar@blackberry.com>
Change-Id: If6220191432ef965bde3c8dbe4a10d89e222ba6f
Reviewed-by: Orgad Shaneh <orgads@gmail.com>
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

tests/cpplocators/testdata_basic/file1.cpp

@@ -12,6 +12,10 @@ int myVariable;
 
 int myFunction(bool yesno, int number) {}
 
+void pointOfService() {}
+int getPosition() { return 0; }
+int positiveNumber() { return 2; }
+
 enum MyEnum { V1, V2 };
 
 class MyClass