Makefiles and folder structure for C/C++ development

• Linux only (for now?)
• This project expects both src and tests folder to contain a main file named main.EXT where EXT are any of the default C/C++ extensions
  • C:
    • .c
  • C++:
    • .cc
    • .cp
    • .cxx
    • .cpp
    • .CPP
    • .c++
    • .C
  • By "main file" we mean the file that actually contains a main function

• Automatically detects subfolders
• Compiler selection according to source extension

• Manjaro

See TODO.md

• For autotest.sh:
  • entr