Stanard replace "or" to "||" & "and" to "&&"

Signed-off-by: Sylwke3100 <sylwek3100@gmail,com>
Change type method isGroup to bool and remove unused variable

Signed-off-by: Sylwke3100 <sylwek3100@gmail,com>
Add Clear method to CristallValues

Signed-off-by: Sylwke3100 <sylwek3100@gmail,com>