Make photonlib complain if versions don't match (#302)

Adds messages if Photon isn't detected or major versions don't match

shared/PhotonVersion.java.in

@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) Photon Vision.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package org.photonvision;
+
+/*
+* Autogenerated file! Do not manually edit this file. This version is regenerated
+* any time the publish task is run, or when this file is deleted.
+*/
+
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+@SuppressWarnings("ALL")
+public final class PhotonVersion {
+    public static final String versionString = "${version}";
+    public static final String buildDate = "${date}";
+    public static final boolean isRelease = !versionString.startsWith("dev");
+
+    public static final boolean versionMatches(String other) {
+        String c = versionString;
+        Pattern p = Pattern.compile("v[0-9]+.[0-9]+.[0-9]+");
+        Matcher m = p.matcher(c);
+        if (m.find()) {
+            c = m.group(0);
+        } else {
+            return false;
+        }
+        m = p.matcher(other);
+        if (m.find()) {
+            other = m.group(0);
+        } else {
+            return false;
+        }
+        return c.equals(other);
+    }
+}