Improve english & re-vamp whole book

[Zagita21]

Thanks for making this guide! While going through trying to understand, having many German friends I recognised instantly some of the odd use of English, and in fact a lot of the difficulties in understanding it came from some issues in the language, in addition to some errors and other issues. I therefore did a wholesale revamp of the book while going through it (which took much longer than expected)

general improvements & corrections:
Main objective was to make this easier to read and understand, to correct the grammatical errors and to make the English sound more natural.

• Germanglish -> English ;) (eg "Hopefully, ..." -> "Thankfully, ...", excessive use of commas and long incomprehensible sentences, odd Deutsch-sounding turns of phrase or just incorrect grammar or punctuation, inconsistent tenses, incorrect or awkward use of this/that would/will, "nevermore" etc. etc.)
  e.g. (from before edit)
  "Now let's take a look at handling results with 2-4 options. It is actually
  interesting, that using 2, even if the transaction is performed by sub-call
  succeed, we may now take a look at the data it returned with Reply, and on
  its final state after it finished, and we can still decide, that act as a
  whole is a failure, in which case everything would be rolled back - even
  currency transfer performed by external contract."
  Totally incomprehensible ;)

• changed to gender-neutral where unnecessary to specify

• unnecessary repetitive language (sometimes) removed (eg "As mentioned before..." )

• removed inconsistencies in use of I/we (chose the less egotistic version to go with). This is probably the most "opinionated" change, but I think it makes it less weird to read.

• I mostly ignored the over-use (and often incorrect use) of hypenation (-), assuming it is stylistic, except where it was painful. Also left in some anachronisms which nevertheless allow character of the author to pass through

• I also noticed that there is quite a bit of repetition in the second part of the book, almost as if two separate documents were pulled together? Anyway, of course I just corrected it as it is (and was useful to have the review on the topics anyway :) )

• of course it is possible that some small gremlins crept in, but I did two passes and it is in my opinion a much improved script

I do believe the result is much easier to read and understand, which will mean it is more accessible, so I hope it is helpful, and thanks again for sharing your deep knowledge and skills with us! :)