Create separate output folders for Debug/Release configs when building unit tests

[Jeroen Wiert Pluimers]

Currently both the Debug and Release versions Spring.Tetsts.exe end up in the same directory for each Delphi version.

This means that after a build you cannot distinguish the two and determine under what circumstances tests fail or succeed.

1. Create separate output folders for Debug/Release configs when building unit tests
2. If build.exe cannot cope with that change yet, modify it so it can still execute these unit tests.

Spring4D\Tests\Bin\DelphiXE\Spring.Tests.exe
Spring4D\Tests\Bin\DelphiXE2\Win32\Spring.Tests.exe
Spring4D\Tests\Bin\DelphiXE2\Win64\Spring.Tests.exe
Spring4D\Tests\Bin\DelphiXE3\Win32\Spring.Tests.exe
Spring4D\Tests\Bin\DelphiXE3\Win64\Spring.Tests.exe
Spring4D\Tests\Bin\DelphiXE4\Win32\Spring.Tests.exe
Spring4D\Tests\Bin\DelphiXE4\Win64\Spring.Tests.exe
Spring4D\Tests\Bin\DelphiXE5\Win32\Spring.Tests.exe
Spring4D\Tests\Bin\DelphiXE5\Win64\Spring.Tests.exe
Spring4D\Tests\Bin\DelphiXE6\Win32\Spring.Tests.exe
Spring4D\Tests\Bin\DelphiXE6\Win64\Spring.Tests.exe