Implement dart scorer plugin application.

Edit:
    - Add name to credits
    - Add entry in manual

Change-Id: I0e0b062e001ae9134db3ee6e4fba21e93ddd04ee

manual/plugins/dart_scorer.tex

@@ -0,0 +1,17 @@
+\subsection{Dart Scorer}
+
+The dart scorer plugin allows scoring a game of darts (301/501) for two players. It supports modifiers for double/triple hits, bullseye, undo, and game saving and resuming.
+
+\begin{btnmap}
+  \PluginUp, \PluginDown, \PluginLeft, \PluginRight
+  \opt{HAVEREMOTEKEYMAP}{& \PluginRCUp, \PluginRCDown, \PluginRCLeft, \PluginRCRight}
+  & Move cursor\\
+
+  \PluginSelect
+  & Select button under cursor\\
+
+  \nopt{IPOD_4G_PAD,IPOD_3G_PAD}{\PluginCancel}
+  \opt{IPOD_4G_PAD,IPOD_3G_PAD}{Long \ButtonSelect}
+  \opt{HAVEREMOTEKEYMAP}{& \PluginRCCancel}
+  & Go to menu\\
+\end{btnmap}

manual/plugins/main.tex

@@ -246,6 +246,8 @@ option from the \setting{Context Menu} (see \reference{ref:Contextmenu}).}
 
 \opt{rtc}{\input{plugins/clock.tex}}
 
+\input{plugins/dart_scorer.tex}
+
 \input{plugins/dict.tex}
 
 \input{plugins/disktidy.tex}