This commit is a squash and merge of a whole load of commits that I have
edited the commit messages from:

The previous powershell scripts have been renamed to include "old" in them
but I have choosen to use the older Windows cmd.exe to run MinGW32/64
bash terminals and to do the commands as bash scripts rather than
powershell ones.

I want to see how far the, now, two, builds get...

Move to invoking sh.exe direct from .appveyor.yml directly

Fix directory separators.

Flip and double some directory separators

Revise sh if tests

Revise pacman options

Reduce extent of pacman use - only install package

Don't do a system upgrade as that is likely to need a restart to achieve!

switch to using the user (--local) rocktree for luarock as it seems we
cannot access the system one because we are not privileged (administrator).

Try and find out which luarock is being a problem

Further lua tweaking and adding MSYS2 package cache

Tweak build directory settings

Fixup workaround for large font resource file

Change many uses of mingw32/64 to be set with variable

Try a different way to get the Lua configuration

Add some useful packages

I didn't realise that cat.exe was not in the base install but in coreutils
and cygpath was in msys2-runtime. Also the location of some MSYS2 utilitys
was in `/usr/bin` and not `/bin` - which is probably a symlink to the
former.

Impliment a fix for broken luarocks in MINGW32 case

The `/mingw32/share/lua/5.1/luarocks/site_config.lua` file is malformed
in comparison to the `/mingw64/share/lua/5.1/luarocks/site_config.lua` and
this is enough to cause a `luarocks` invocation without any arguments to
report that the "system" configuration file is not present - which prevents
system rocks to be installed.

Redo site_config.lua edit & add missing yajl package

Remove some now unused files and fix some code-factor warnings

The Windows executable is being saved but we still need to arrange for the
bundle to be build and then distributed.

Import files needed and make Windows package archive

Tweak some paths and make packaging script run earlier

Make the zip archives have distinguishable names

Fixup: arrange for more needed MSYS packaged libraries to be included

As well as the OpenSSL needed for secure connections there were some
graphics and compression libraries that also need to be included (some
icons could not be shown on the connections dialogue). Also needed was the
SDL2 library that GamePad support needs.
libzstd.dll
liblzma-5.dll
libwebpdemux-2.dll
libwebp-7.dll
libtiff-5.dll
libjpeg-8.dll
libjasper-4.dll
libcrypto-1_1-x64.dll
libssl-1_1-x64.dll
SDL2.dll

BugFix: enable CMake builds to work on non-Windows platform

Signed-off-by: Stephen Lyons <slysven@virginmedia.com>

…Build_take2

This should remove a couple of files from the overall changes as the
development branch now has some changes that I cherry-picked over
from a different but now merged branch.

Signed-off by: Stephen Lyons <slysven@virginmedia.com>