Use pure-Lua for bitwise operations, instead of BitOp in Lua 5.1

[smarek]

Possible candidate library/module: https://github.com/davidm/lua-bit-numberlua

• Replace native bit/bit32 interfaces with pure-lua module
  • Alias used module functions (band,bor,rshift,lshift, ..) if necessary
• Check performance did not go to hell
• remove BitOp dependency from kaitai-io/ci_targets@ec32dd9#diff-fa5a323febe0889c4e2f0a130b4cde4aR29