Remove serialization service (microsoft#661)

- This isn't actually used so is dead code. Would like to clean up before refactoring other code areas.

build.json

@@ -18,7 +18,6 @@
   "MainProjects": [     
     "Microsoft.SqlTools.ServiceLayer",
     "Microsoft.SqlTools.Credentials",
-    "Microsoft.SqlTools.Serialization",
     "Microsoft.SqlTools.ResourceProvider"
   ]
 }

sqltoolsservice.sln

@@ -70,8 +70,6 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Microsoft.SqlTools.ServiceL
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Microsoft.SqlTools.ServiceLayer.TestEnvConfig", "test\Microsoft.SqlTools.ServiceLayer.TestEnvConfig\Microsoft.SqlTools.ServiceLayer.TestEnvConfig.csproj", "{2C290C58-C98D-46B2-BCED-44D9B67F6D31}"
 EndProject
-Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Microsoft.SqlTools.Serialization", "src\Microsoft.SqlTools.Serialization\Microsoft.SqlTools.Serialization.csproj", "{75E1A89F-9DF6-4DA3-9EF1-5FD966331E06}"
-EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Microsoft.SqlTools.ResourceProvider", "src\Microsoft.SqlTools.ResourceProvider\Microsoft.SqlTools.ResourceProvider.csproj", "{6FEE7E14-8A1D-454E-8F7C-B63597801787}"
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Microsoft.SqlTools.ResourceProvider.Core", "src\Microsoft.SqlTools.ResourceProvider.Core\Microsoft.SqlTools.ResourceProvider.Core.csproj", "{70E63BC1-2C82-41C0-89D6-272FD3C7B0C9}"
@@ -145,12 +143,6 @@ Global
 		{2C290C58-C98D-46B2-BCED-44D9B67F6D31}.Integration|Any CPU.Build.0 = Debug|Any CPU
 		{2C290C58-C98D-46B2-BCED-44D9B67F6D31}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{2C290C58-C98D-46B2-BCED-44D9B67F6D31}.Release|Any CPU.Build.0 = Release|Any CPU
-		{75E1A89F-9DF6-4DA3-9EF1-5FD966331E06}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{75E1A89F-9DF6-4DA3-9EF1-5FD966331E06}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{75E1A89F-9DF6-4DA3-9EF1-5FD966331E06}.Integration|Any CPU.ActiveCfg = Debug|Any CPU
-		{75E1A89F-9DF6-4DA3-9EF1-5FD966331E06}.Integration|Any CPU.Build.0 = Debug|Any CPU
-		{75E1A89F-9DF6-4DA3-9EF1-5FD966331E06}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{75E1A89F-9DF6-4DA3-9EF1-5FD966331E06}.Release|Any CPU.Build.0 = Release|Any CPU
 		{6FEE7E14-8A1D-454E-8F7C-B63597801787}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
 		{6FEE7E14-8A1D-454E-8F7C-B63597801787}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{6FEE7E14-8A1D-454E-8F7C-B63597801787}.Integration|Any CPU.ActiveCfg = Debug|Any CPU
@@ -186,7 +178,6 @@ Global
 		{E985A5AA-63E4-48DC-A6D8-D3953A50D7E3} = {AB9CA2B8-6F70-431C-8A1D-67479D8A7BE4}
 		{501DB3B2-AF92-41CF-82F6-780F9C37C219} = {AB9CA2B8-6F70-431C-8A1D-67479D8A7BE4}
 		{2C290C58-C98D-46B2-BCED-44D9B67F6D31} = {AB9CA2B8-6F70-431C-8A1D-67479D8A7BE4}
-		{75E1A89F-9DF6-4DA3-9EF1-5FD966331E06} = {2BBD7364-054F-4693-97CD-1C395E3E84A9}
 		{6FEE7E14-8A1D-454E-8F7C-B63597801787} = {2BBD7364-054F-4693-97CD-1C395E3E84A9}
 		{70E63BC1-2C82-41C0-89D6-272FD3C7B0C9} = {2BBD7364-054F-4693-97CD-1C395E3E84A9}
 		{EFB39C03-F7D2-4E8D-BE51-09121CD71973} = {2BBD7364-054F-4693-97CD-1C395E3E84A9}