The big miniz zip64 merge

Currently merging miniz v1.15 into my in-progress zip64 branch which is being used/tested in the Linux OpenGL debugger engine project I've been working on. The left pane is v1.15, right is the new version with zip64.

Fun times. The new version still needs to be C-ified in a few places. I'm actually liking the purity of C for some strange reason, it's amazing how fast it compiles vs. C++. I'm so used to glacially slow compiles that when I used TCC (Tiny C Compiler) again it appeared to complete so fast that I thought it had silently crashed.