Pylsv2

reported as 59 : parsing table files could lead to an exception

**Full Changelog**: https://github.com/drunsinn/pyLSV2/compare/v1.3.2...v1.3.3

this is a maintenance release that changes the build process from setup.py to pyproject.toml

**Full Changelog**: https://github.com/drunsinn/pyLSV2/compare/v1.2.1...v1.3.1

this minor release fixes some typos (51) and access to member variables (52)

**Full Changelog**: https://github.com/drunsinn/pyLSV2/compare/v1.2...v1.2.1

this fixes an error in the paged reading of plc memory with `read_plc_memory`. Depending on the number of values read at once the transfer has to be split into multiple packages. When doing so the start address of the next package wasn't calculated correctly which lead to an offset in the data. This was probably introduced in 40. Was discovered while debugging for 48 but isn't related.

- closes 47
- add requirements.txt for venv