Moved ftsort sources to bin/ftsort
Moved tape_config.h into bin/ftsort
Implemented command line parsing for ftsort in tape_config.cpp
ftsort binary is in working state
Added 2 new constructors for FileTape which copy the size of existing tape into a new one
Implemented external sort of a Tape using heap sort
Rewritten FileTape constructors implementation to better take advantage of existing constructor calls
Added const to some parameters to indicate their immutability
Added unit tests for external_sort
Slight rewrite of fill_file_with_empty_cells
Adjusted seek offset in some FileTape operations
Unit tests now work with vector of uint32_t as source of test data
Removed explicit keyword before every constructor in FileTape
Added getters for private fields in FileTape
Made Tape's copy construcot marked as delete by default
Implemented custom destrucor for FileTape
Added explicit move and copy constructors to FileTape
Added generate_tmp_file_name method to tape namespace
Removed assets directory from tests - testing data should be provided in the test's cpp file
Changed file format for a FileTape - added and example in the class comment
Removed prev_line_pos and at_first_line fields from FieldTape
Changed Tape data type from int32_t to uint32_t
Cleand up includes
Implemented FileTape methods
Unit tests are in working state
Disabled warnings as errors
bumped the cmake min version to 3.12 for c++20 support and -j flag
Placed a CMakeLists.txt in each subdirectory of the project
