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