feat(project): add ability to include license header for source files

These changes includes the ability to add a license header to all source files (.cs) when a license
that recommends a license header is used.

re #26

__tests__/project/default/aliases.cs

@@ -1,3 +1,9 @@
+/*
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
 namespace Cake.TestApp
 {
     using Cake.Core;

__tests__/project/default/nunit/testAliasesTests.cs

@@ -1,3 +1,9 @@
+/*
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
 namespace Cake.TestApp.Tests
 {
     using System;

__tests__/project/default/nunit/testRunnerTests.cs

@@ -1,3 +1,9 @@
+/*
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
 namespace Cake.TestApp.Tests
 {
     using System;

__tests__/project/default/project/project.csproj

@@ -17,7 +17,7 @@
         <Copyright>Copyright © $(FullYear) — Kim Nordmo</Copyright>
         <Description>Cake addin generation test</Description>
         <PackageIconUrl>https://cdn.jsdelivr.net/gh/cake-contrib/graphics/png/cake-contrib-medium.png</PackageIconUrl>
-        <PackageLicenseExpression>MIT</PackageLicenseExpression>
+        <PackageLicenseExpression>MPL-2.0</PackageLicenseExpression>
         <PackageProjectUrl>https://github.com/AdmiringWorm/Cake.TestApp</PackageProjectUrl>
         <PackageTags>cake;addin;testapp</PackageTags>
         <RepositoryUrl>https://github.com/AdmiringWorm/Cake.TestApp.git</RepositoryUrl>

__tests__/project/default/runner.cs

@@ -1,3 +1,9 @@
+/*
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
 namespace Cake.TestApp
 {
     using System;

__tests__/project/default/settings.cs

@@ -1,3 +1,9 @@
+/*
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
 namespace Cake.TestApp
 {
     using System;

__tests__/project/default/testAliasesFixture.cs

@@ -1,3 +1,9 @@
+/*
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
 namespace Cake.TestApp.Tests
 {
     using System.Collections.Generic;

__tests__/project/default/testRunnerFixture.cs

@@ -1,3 +1,9 @@
+/*
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
 namespace Cake.TestApp.Tests
 {
     using Cake.Testing.Fixtures;

__tests__/project/default/xunit/testAliasesTests.cs

@@ -1,3 +1,9 @@
+/*
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
 namespace Cake.TestApp.Tests
 {
     using System;

__tests__/project/default/xunit/testRunnerTests.cs

@@ -1,3 +1,9 @@
+/*
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
 namespace Cake.TestApp.Tests
 {
     using System;