Add "display_name" configuration option and use its value instead of
the hard coded one.

Patch by Diego N. Barbato

--- a/app.cpp	1970-01-01 01:00:00.000000000 +0100
+++ b/app.cpp	2019-04-27 13:48:23.479133531 +0200
@@ -190,7 +190,13 @@
 }
 
 void App::Run() {
-	DisplayName = DISPLAY;
+	/* Read configuration */
+	cfg = new Cfg;
+	char *cfgfile = getenv("SLIM_CFGFILE");
+	if (!cfgfile) cfgfile = CFGFILE;
+	cfg->readConf(cfgfile);
+
+	DisplayName = cfg->getOption("display_name").c_str();
 
 #ifdef XNEST_DEBUG
 	char* p = getenv("DISPLAY");
@@ -200,11 +206,7 @@
 	}
 #endif
 
-	/* Read configuration and theme */
-	cfg = new Cfg;
-	char *cfgfile = getenv("SLIM_CFGFILE");
-	if (!cfgfile) cfgfile = CFGFILE;
-	cfg->readConf(cfgfile);
+	/* Read theme */
 	string themebase = "";
 	string themefile = "";
 	string themedir = "";
@@ -911,9 +913,7 @@
 	static const int MAX_XSERVER_ARGS = 256;
 	static char* server[MAX_XSERVER_ARGS+2] = { NULL };
 	server[0] = (char *)cfg->getOption("default_xserver").c_str();
-	string argOption =</td></tr></table>
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