[UPD] Enforce C++ version and improve setup.py flexibility

Context

1. C++-14

Fixes aidge_core#225 (closed) for aidge_backend_cuda. The same update must be done on every module.

2. Python module compilation

Also increase setup.py compilation option flexibility using environment variables. Made to work with aidge!97 (merged)

changed milestone to %aidge v0.5.0

added Compilation ⚙ Unit-test 🧪 labels

assigned to @pineapple

changed target branch from main to dev

added 5 commits

• fcbb83a6 - 1 commit from branch dev
• 920d6d0a - Enforce C++-14 in 'CMakeLists.txt'
• f0858122 - Change Python minimum version 3.7 -> 3.8
• 34594a2f - UPD: 'setup.py' to access compilation options from environment variables set by 'setup.sh'
• 59629a51 - Change 'fmt::print' calls for 'Log::info' in some tests

Compare with previous version

enabled an automatic merge when all merge checks for 59629a51 pass

mentioned in commit 807db262

merged