Big overhaul to fix includes

• Make every Lofty header file able to be included by itself
• Remove “god” include/lofty.hxx
• Implement clunky mechanism to avoid pulling in definitions of dependencies

Win32: use closesocket() instead of CloseHandle() for, well, sockets

Move out definitions accidentally put in #if

Simplify selection of pass/fail

Update copyright for files changed recently

Replace OS X references with macOS

Add missing LOFTY_SL()

Update README.md to mention complemake exec

Abamake renamed to Complemake

Create git repository