Update build system and tests

#427

• Add support for dynamic input/output node shapes in ONNXrt interface
• Remove Conan support
  #424
• Test data is installed to install directory
• Tests read data with relative paths

Fixing the build system and logging

Add missing <ctime> includes
Make sure Conan passes on command-line options to CMake
Disable MPI support by default
Add custom logger
Remove spdlog dependency

Initial Tensorflow Model Release

• Add tensor flow model (via cppflow library) as an alternative to proximal approach to minimisation in the forward-backward algorithm.
• Add Conan based build system to manage dependencies and updates to CI
• Bug fixes
• Refactoring and linting to modernise some code

Fixing the version number

Minor release to include the version numbers

MPI and MAP Estimation Release

• Added Forward Backward Algorithm (FISTA)
• Added MPI wrappers and functionality
• Added Joint MAP estimation
• Added MPI to wavelet operator (i.e SARA)
• Added MPI to ADMM and Dual Forward Backward convergence criteria
• Added MPI to Forward Backward convergence criteria
• Added MPI to proximal operators
• Added credible region estimation
• 1d SARA wavelet transform now works

First release

v0.1

missing case for Accelerate.h