font update; ui remocon fix; save doc elaboration

UI RemoCon fix: RemoCon will no longer widen to the screen width when being used

src/net/torvald/terrarum/serialise/SavegameLedger.kt

@@ -0,0 +1,34 @@
+package net.torvald.terrarum.serialise
+
+import net.torvald.terrarum.Terrarum
+import java.io.File
+import java.io.FileFilter
+import java.io.FileInputStream
+
+
+
+object SavegameLedger {
+
+    private val SAVE_DIRECTORY = File(Terrarum.defaultSaveDir)
+
+    fun hasSavegameDirectory() = SAVE_DIRECTORY.exists() && SAVE_DIRECTORY.isDirectory
+
+    private fun peekFewBytes(file: File, length: Int): ByteArray {
+        val buffer = ByteArray(length)
+        val `is` = FileInputStream(file)
+        if (`is`.read(buffer) != buffer.size) {
+            throw InternalError()
+        }
+        `is`.close()
+        return buffer
+    }
+    private val MAGIC_TEVD = "TEVd".toByteArray()
+
+    fun getSavefileList(): List<File>? {
+        return if (!hasSavegameDirectory()) null
+               else SAVE_DIRECTORY.listFiles().filter { it.isFile && peekFewBytes(it, 4) contentEquals MAGIC_TEVD }
+    }
+
+    fun getSavefileCount() = getSavefileList()?.count() ?: 0
+
+}