[libromdata] Lua: Add support for Lua 5.5 bytecode format.

[DankRank]

xxd -r >5.5.lub <<EOF
00000000: 1b4c 7561 5500 1993 0d0a 1a0a 0488 a9ff  .LuaU...........
00000010: ff04 7856 3412 0888 a9ff ffff ffff ff08  ..xV4...........
00000020: 0000 0000 0028 77c0 0100 0000 0102 0500  .....(w.........
00000030: 5300 0000 0b00 0000 8380 0000 4400 0201  S...........D...
00000040: 4600 0101 0204 0670 7269 6e74 0004 0e48  F......print...H
00000050: 656c 6c6f 2c20 576f 726c 6421 0001 0100  ello, World!....
00000060: 0000 0b40 696e 7075 742e 6c75 6100 0501  ...@input.lua...
00000070: 0000 0000 0000 0105 5f45 4e56 00         ........_ENV.
EOF

== Reading file '5.5.lub'...
-- PUC Lua 5.5 Executable detected
Endianness:           'Little-Endian'
int size:             '4'
lua_Instruction size: '4'
lua_Integer size:     '8'
lua_Number size:      '8'
lua_Number type:      'Floating-point'

[codecov]

Codecov Report

❌ Patch coverage is 0% with 19 lines in your changes missing coverage. Please review.
✅ Project coverage is 23.21%. Comparing base (4433822) to head (763a783).

Files with missing lines	Patch %	Lines
src/libromdata/Other/Lua.cpp	0.00%	19 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #478      +/-   ##
==========================================
- Coverage   23.22%   23.21%   -0.01%     
==========================================
  Files         614      614              
  Lines       48299    48317      +18     
  Branches    10781    10789       +8     
==========================================
  Hits        11218    11218              
- Misses      34756    34774      +18     
  Partials     2325     2325              

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[GerbilSoft]

Codecov report is new, but then again, maybe it isn't; I don't get many PRs here :V

Will go over this in a bit.