* Apache httpd version upgrade to 2.4.20
* Update pre-install in r.json
The pre-install in the r bucket is now architecture specific and
depends on the architecture the user requested, no longer on the
architecture of the user's machine.
* Updated R to version 3.3.0
* Correct faulty hashes for Curl 7.50.2
SHA-256 taken from 7zip;
[curl manifest file tested on external bucket](http://puu.sh/oQq83/d131b4a4fa.png)
Mirror changes:
- mirror confusedbycode.com looks abandoned;
- mirror bintray.com from list Win32/Win64 - Generic (Viktor Szakáts) was chosen
- build project page for windows is hosted on https://github.com/vszakats/harbour-deps
* makes changes to almost all main repo files to be in accordance with .editorconfig
* some files in "test\fixtures\..." were left alone to avoid breaking tests
* NOTE: whitespace changes *only* (`git diff -b` shows no changes)