Texture & mouse functions; refactoring & fixes

- cleaned up and added documentation to engine.h
- refactored CEngine interface and associated structs
- added mouse handling functions in CApplication & CEngine
- fixed bugs in projection matrix setting
- changed texture loading & handling
- added const-values in CDevice & CGLDevice
- changed event management in CApplication
- other minor changes & bugfixes

1 files changed, 2 insertions, 2 deletions

diff --git a/src/app/main.cpp b/src/app/main.cpp
index f857037..9eea6e4 100644
--- a/src/app/main.cpp
+++ b/src/app/main.cpp
@@ -69,10 +69,10 @@ int main(int argc, char *argv[])
 
     CApplication app; // single instance of the application
 
-    Error err = app.ParseArguments(argc, argv);
-    if (err != ERR_OK)
+    if (! app.ParseArguments(argc, argv))
     {
         SystemDialog(SDT_ERROR, "COLOBOT", "Invalid commandline arguments!\n");
+        return app.GetExitCode();
     }
 
     int code = 0;