Delete extracted libraries on exit

Add missing writeJPEGToArray method to Image interface

Limit test dependencies to the test scope

Document how to build JVips with Linux and Docker

Build libpng only once with CMake

Change lib/CMakeLists.txt to build libpng only once when build.sh
is executed several times.

A resolution is to change the find_library name argument to `png`.
See https://cmake.org/cmake/help/latest/command/find_library.html

Add vips_image_write_to_file bidding

Make Image interface an AutoCloseable subclass

Fix failing build on Windows

libvips was not properly linked with the JVipsTest binary on Windows platforms:

```
Linking C shared library JVipsTest.dll
/app/src/main/c/VipsException.c:43: undefined reference to `vips_error_buffer'
/app/src/main/c/VipsException.c:53: undefined reference to `vips_error_clear'
collect2: error: ld returned 1 exit status
```

See criteo#88 (review)

Fix MacOS setup script

⬆️ Update dependencies for libvips 8.10.2