Replace zlib with miniz

[a740g]

Currently, we are using zlib provided by MinGW on Windows or system libraries on other platforms.

This has a potential problem where zlib included with MinGW may be outdated and have security issues which would then get included with all QB64-PE compiled programs that use compression. Also, zlib is not included with toolchains like LLVM MinGW.

Instead, we can use miniz. It is a lighter and efficient alternative to zlib, which provides the same level of compression and decompression functionality. It has a smaller code footprint than zlib and is faster in terms of both compression and decompression speeds. This would result in faster build times, smaller executable sizes and allow us to easily move to the LLVM MinGW toolchain in the future.

Also see #313.