Roadmap for 1.0

[CrazedProgrammer]

• Clean up computer creation code, especially the parts that deal with multiple implementations depending on the platform
• Write a JSON table parser so that there's no dependency on a third-party json.lua library
• Improve term performance significantly so that full-screen games work without slowdown
  - Improve idle CPU usage Not possible without compromising on response time with the current "collect user input for x seconds" method. Idle CPU usage is around 5% (one core, Ryzen 5 1600) with both Lua and LuaJIT.
• Useful defaults for CLI interface depending on platform
  - Add single-file mounts Not a proper solution to the "mounting real files on the PUC platform" problem. There is probably a way to read/write files and directories with only the POSIX tools. Not strictly necessary for 1.0.
• Make the platform-specific methods and platform detection methods generic and conceptually decoupled from the main code. In this way, support for a new platform can be added without touching the base code.
• Implement fs.find
• Implement alphanumeric keycodes
• Implement modifier keys if possible
• Handle SIGTERM signals just like SIGINT
• Flush filesystem on SIGINT
• Handle mouse scroll events

Compatibility improvements:

• Fix crash in BBCards by Bomb Bloke (doesn't crash anymore, but needs a monitor to work)
• Fix crash in Minesweeper by GopherAtl
• Fix crash in Doom by Xelostar
• Fix timing issues in QuickDraw by LDDestroier
• WONTFIX: Fix crash in BBTetris by Bomb Bloke
  This requires a source translator. LuaJIT, Lua 5.2 and Lua 5.3 don't provide the arg table for vararg functions.
• WONTFIX: Fix crash in CCSand by CosmoConsole
  This requires a source translator. LuaJ interprets 16f as 16, whereas the normal Lua variants throw a syntax error.

Terminal-specific issues:

• Fix mouse controls not working in urxvt.
• Fix backspace not working in xterm.