Update task news to support 3.0.0 (#3342)

* Introduce Version, use it to check current version in custom reports
* Support multiple versions in 'task news'

src/Version.h

@@ -0,0 +1,72 @@
+////////////////////////////////////////////////////////////////////////////////
+//
+// Copyright 2024, Dustin Mitchell.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+//
+// https://www.opensource.org/licenses/mit-license.php
+//
+////////////////////////////////////////////////////////////////////////////////
+
+#ifndef INCLUDED_VERSION
+#define INCLUDED_VERSION
+
+#include <string>
+
+// A utility class for handling Taskwarrior versions.
+class Version {
+public:
+  // Parse a version from a string. This must be of the format
+  // digits.digits.digits.
+  explicit Version(std::string version);
+
+  // Create an invalid version.
+  Version() = default;
+
+  Version(const Version &other) = default;
+  Version(Version &&other) = default;
+  Version &operator=(const Version &) = default;
+  Version &operator=(Version &&) = default;
+
+  // Return a version representing the release being built.
+  static Version Current();
+
+  bool is_valid() const;
+
+  // Compare versions.
+  bool operator<(const Version &) const;
+  bool operator<=(const Version &) const;
+  bool operator>(const Version &) const;
+  bool operator>=(const Version &) const;
+  bool operator==(const Version &) const;
+  bool operator!=(const Version &) const;
+
+  // Convert back to a string.
+  operator std::string() const;
+
+  friend std::ostream& operator<<(std::ostream& os, const Version& version);
+
+private:
+  int major = -1;
+  int minor = -1;
+  int patch = -1;
+};
+
+#endif
+////////////////////////////////////////////////////////////////////////////////