add cache clear menu option

app/src/main/java/oppen/tva/io/RuntimeCache.kt

@@ -13,4 +13,6 @@ object RuntimeCache {
     }
 
     fun get(uri: URI): Pair<GeminiResponse.Header, List<String>>? = lruCache[uri.toString()]
+
+    fun clear() = lruCache.evictAll()
 }

app/src/main/java/oppen/tva/ui/TvaActivity.kt

@@ -16,6 +16,7 @@ import com.google.android.material.snackbar.Snackbar
 import oppen.tva.R
 import oppen.tva.databinding.ActivityTvaBinding
 import oppen.tva.io.GeminiResponse
+import oppen.tva.io.RuntimeCache
 import oppen.tva.io.TvaState
 import oppen.tva.io.history.CacheInterface
 import oppen.tva.ui.about.AboutDialog
@@ -91,6 +92,10 @@ class TvaActivity : AppCompatActivity() {
                             startActivity(Intent.createChooser(this, null))
                         }
                     }
+                    R.id.overflow_menu_clear_cache -> {
+                        RuntimeCache.clear()
+                        showAlert("Runtime cache cleared")
+                    }
                     R.id.overflow_menu_about -> AboutDialog.show(this)
                     R.id.overflow_menu_set_home -> {
                         SetHomeDialog.show(this, binding.addressEdit.text.toString()){

app/src/main/res/menu/overflow_menu.xml

@@ -9,6 +9,8 @@
             android:title="@string/set_home" />
     </group>
     <group android:id="@+id/other" >
+        <item android:id="@+id/overflow_menu_clear_cache"
+            android:title="@string/clear_cache" />
         <item android:id="@+id/overflow_menu_about"
             android:title="@string/about" />
     </group>

app/src/main/res/values/strings.xml

@@ -16,4 +16,5 @@
 \nThis 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 any later version.\n
 \nThis 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.\n
 \nYou should have received a copy of the GNU General Public License along with this program.  If not, see www.gnu.org/licenses</string>
+    <string name="clear_cache">Clear cache</string>
 </resources>