Update tag in readme

Use explicit if DEFINED

Update version to 3.0.0

Reorder options

Update readme tag to v2.0.0

Differentiate between reading all output using a sink and reading sep…

…arate messages using a parser in reproc::process

Remove unnecessary windows.h include

Fix missing include

Move errno mapping for errors from action's outside of process_create…

… + map extra errors for execvp

Change reproc_stop (and C++ equiv) to receive a separate timeou value…

… for each passed cleanup flag