New API for encoding/decoding

Changes

• The new API handles all input and output information as unpacked bits, meaning that each byte holds only one useful bit of information located at the LS bit
• Decoders are now supporting soft-decoding. Each bit is represented by a int8_t symbol, where -128 is a strong zero and 127 a strong one.
• Add coverage testing at the CI
• Exhaustive testing for the encoding/decoding process through the CPPUnit testing suite

TODO

• Add noise and faulty bits at the CCPUnit testing

Fixes

Fixes #14 (closed), #17 (closed), #18 (closed), #22 (closed)