Tidy: Move EquationSystem::EvaluateFunction and Forcing::EvaluateFunction into separate class

See merge request !759

Use <chrono> in Timer

See merge request !807

Fix CR issue in the GEO reader

See merge request !805

Fix 2D varopti code

See merge request !806

Fix small CMake issue

See merge request !804

fix missing if in thirdparty ccm

See merge request !802

Thirdparty compilation of libccmio

See merge request !799

# Conflicts:
#   CHANGELOG.md

Fix issue with uninitialised variable sometimes causing random BC entries

See merge request !801

Tidy up CMake infrastructure

See merge request !770