Build and package on x86

There were two parallel versions of all build and installer files (ps1, bat, mak, wxs) for x86 and x64 versions and nothing fundamentally different between them.

Collapse and simplify:
* Get rid of powershell and configuration xml files as they weren't really helping
* Collapse the mak and Wix files and use consistent parametrization between both
* Move msi building into mak file

Additionally:
* Use clear defaults in the mak file and fail loudly when appropriate
* Use short/8.3 names for the dlls due to [WiX issue](http://sourceforge.net/p/wix/bugs/1070/) that was being worked around incorrectly (modify_msi.vbs)
* Update the Product GUIDs as that wasn't done after the last release
* Add a simple build helper batch script to reduce typing in the default case

Jenkins job will need to react to build tweaks.