Replace <term><command><arg> with <term><property><parameter> to describe

options in the config file because:
 * <arg> can only be used within <cmdsynopsis>.
 * <cmdsynopsis> does not allow text outside <command> and <arg>.
 * <arg> does not allow decorating elements like <literal> or <emphasis>.
This fixes #2803057.

Add shortcut entities for commonly used parameters (yes/no, size).
Remove Debian patch which is obsoleted by above changes.

docs/lcdproc-user/parameters.ent

@@ -0,0 +1,21 @@
+<!-- Entity for a yes/no parameters with yes as default value -->
+<!ENTITY parameters.yesdefno "
+    {
+      <emphasis><parameter><literal>yes</literal></parameter></emphasis> |
+      <parameter><literal>no</literal></parameter>
+    }" >
+
+<!-- Entity for a yes/no parameters with no as default value -->
+<!ENTITY parameters.yesnodef "
+    {
+      <parameter><literal>yes</literal></parameter> |
+      <emphasis><parameter><literal>no</literal></parameter></emphasis>
+    }" >
+
+<!-- Entity for a typical size parameter -->
+<!ENTITY parameters.size "
+    <parameter>
+      <replaceable>WIDTH</replaceable>
+      <literal>x</literal>
+      <replaceable>HEIGHT</replaceable>
+    </parameter>" >