AtU8 UTF8 atoms chunk decompilation

[KronicDeth]

Resolves #772

Changelog

Enhancements

• Include specific message for each decompilation error reason.
• Regression test for Decompilation not working with OTP 20 using AtU8 chunk for ASCII atoms #772
• AtU8 UTF8 atoms chunk decompilation to support OTP 20 compiled .beam files.
• Regression test for Elixir 1.5.0 announcement to ensure that unicode from AtU8 chunk can be read from beam file produced by following Elixir code:

defmodule AtU8Test do
  def こんにちは世界 do
    :こんにちは世界
  
     saudação = "Bom dia!"

    saudação
  end
end

Bug Fixes

• Decompilated -> Decompilation