Strip out everything earlier than Windows XP

[delphidabbler]

It's been almost 20 year since Window 9x came to an end and over ten since Windows 2000 bit the dust. So is there much point having all the legacy code that supports them cluttering up the unit?

This would be a breaking change, so there's also an opportunity to tidy up the API.

[delphidabbler]

If we drop support for compilers earlier than Delphi XE (issue #2), then there's no point supporting OSs the programs generated by XE can't run on. Need to check which they are.

[delphidabbler]

If we drop support for compilers earlier than Delphi XE (issue #2), then there's no point supporting OSs the programs generated by XE can't run on. Need to check which they are.

After some research, this proves to be difficult and maybe impossible without access to every OS.