[tools] cleanVisual studio

removed visual studio project files

src/Tools/plugins/widget/FreeCAD_widgets.sln

@@ -1,25 +0,0 @@
-
-Microsoft Visual Studio Solution File, Format Version 12.00
-# Visual Studio 15
-VisualStudioVersion = 15.0.28307.1062
-MinimumVisualStudioVersion = 10.0.40219.1
-Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "FreeCAD_widgets", "FreeCAD_widgets.vcxproj", "{0FFD6565-C54C-3BE4-96B6-AAFB7DA921A1}"
-EndProject
-Global
-	GlobalSection(SolutionConfigurationPlatforms) = preSolution
-		Debug|x64 = Debug|x64
-		Release|x64 = Release|x64
-	EndGlobalSection
-	GlobalSection(ProjectConfigurationPlatforms) = postSolution
-		{0FFD6565-C54C-3BE4-96B6-AAFB7DA921A1}.Debug|x64.ActiveCfg = Debug|x64
-		{0FFD6565-C54C-3BE4-96B6-AAFB7DA921A1}.Debug|x64.Build.0 = Debug|x64
-		{0FFD6565-C54C-3BE4-96B6-AAFB7DA921A1}.Release|x64.ActiveCfg = Release|x64
-		{0FFD6565-C54C-3BE4-96B6-AAFB7DA921A1}.Release|x64.Build.0 = Release|x64
-	EndGlobalSection
-	GlobalSection(SolutionProperties) = preSolution
-		HideSolutionNode = FALSE
-	EndGlobalSection
-	GlobalSection(ExtensibilityGlobals) = postSolution
-		SolutionGuid = {EC696D06-B20E-41F8-94A6-AFEB0D9F3D25}
-	EndGlobalSection
-EndGlobal