WIXBUG:4471

Add warning about late RemoveExistingProducts scheduling with
PerfCounterManifest.
WIXBUG:4460

Switch license from HTML to plain text.
Setup cleanup

Use MediaTemplate in WiX setup. Include native SDK packages when the
corresponding compiler is present, not just when the corresponding SDK
is present. (The SDK is needed only to create the C++ custom action
templates.)
WIXBUG:4473

Remove Wui.csproj from Wix.sln.
Merge pull request #103 from barnson/bug4471

Conflicts:
	History.md
Merge pull request #105 from barnson/bug4460

Conflicts:
	History.md
Merge pull request #108 from barnson/setup.tweaks

Conflicts:
	History.md
Merge pull request #111 from barnson/bug4473.1

Conflicts:
	History.md