QE code style

1. Class names in CamelCase, starting with capital letter, example: SomeClass
2. Class methods names in lowerCamelCase, starting with small letter, example: someFunction(int first_param)
3. Class members names in m_camelCase, example: m_someMember
4. Local variables and function parameters in snake_case – small letters with underscores, example int max_count
5. File names in small letters, example: someclass.cpp
6. Use TABS for indentation
7. Rest is the same as Qt code style: https://wiki.qt.io/Qt_Coding_Style