Non-Release 39.3.0

This Non-Release focuses on catching up with the remaining r39 features and bugfixes that went in while @indigodarkwolf was busy with day job stuff, and overhauling some of the internals of Box16 since he was unhappy with the mess that had been created while troubleshooting past attempts to reconcile various conflicts between command-line parameters and path-search rules.

As always: Bug reports welcome. PRs welcome.

Pre-built Windows zip files are available for Box16. You still need to build your own rom.bin from the official X16 emulator's r39 release, just place it in the same directory as Box16.exe.

Changelist:

• Added support for VIA timers. (akumanatt)
• Can now change v-sync settings. (jburks)
• First pass at supporting patch files for ROM images.
• Command line and ini file options overhaul.
• Fix to resetting during WAI instruction.
• Added hypercall support for r39 rom's headerless LOAD command.
• Fixing BRA and BBxn cycles count. (akumanatt)
• Adjusting video timings to match actual VERA. (akumanatt)