Added window_with_count
Added sequence_equal
Bugfix for comparing observable with array
Added missing virtual methods
Adding fixes for observable window
Started splitting into individual files
Fixed tests for any and all ++
Fixes for average, where, select and window
Merge
Splitted more operators and tests
Deleted files
Renamed dir to match node test pattern
Deleted files
Removed more functions from standardsequenceoperators
Merge
Merge from develop