opengl: more error handling

Show message box on fail.
Enable debug output only when logfile is defined; performance optimization.
Fail if reported opengl version is less than 3.0 or errors are generated
after context is created; fixes some crashes on unsupported hardware or
faulty drivers.

src/win/languages/ru-RU.rc

@@ -530,6 +530,8 @@ BEGIN
     IDS_2149	"Образы кассет (*.PCM;*.RAW;*.WAV;*.CAS)\0*.PCM;*.RAW;*.WAV;*.CAS\0Все файлы (*.*)\0*.*\0"
     IDS_2150	"Картридж %i: %ls"
     IDS_2151	"Образы картриджей (*.A;*.B;*.JRC)\0*.A;*.B;*.JRC\0Все файлы (*.*)\0*.*\0"
+    IDS_2152	"Error initializing renderer"
+    IDS_2153	"OpenGL (3.0 Core) renderer could not be initialized. Use another renderer."
 END
 
 STRINGTABLE DISCARDABLE