cicwi/PyCorrectedEmissionCT: Release version 0.2.3

New release adding the following features and fixing the following bugs: Added On-demand padding for Wavelet regularizer Projection intensity rescaling for different angles in base projector Support for 3D absorption maps (but not thouroughly tested, yet) Data-term residual computation to all solvers Some tests to solvers and regularizers Automated testing and linting on github workflows Support for ASTRA's super-sampling of pixels and voxels Implemented scipy's sparse LinearOperator interface for the projectors Utility min-log and simple flat-fielding functions for transmission data ### Fixed Copy-paste error, and detector data axis order in SART algorithm implementation Weights for masks in SART algorithm Error in unpreconditioned CP implementation Applied linting changes, to improve the readability of the cod