Add a special exception logger

We'll need this to make sure that we can redirect caught exceptions
printed in `src/common/` to the correct file if `YABRIDGE_DEBUG_FILE` is
set.

src/plugin/vst2-plugin.cpp

@@ -50,7 +50,7 @@ extern "C" VST_EXPORT AEffect* VSTPluginMain(
 
         return &bridge->plugin;
     } catch (const std::exception& error) {
-        Logger logger = Logger::create_from_environment();
+        Logger logger = Logger::create_exception_logger();
         logger.log("Error during initialization:");
         logger.log(error.what());
 

src/plugin/vst3-plugin.cpp

@@ -53,7 +53,7 @@ bool InitModule() {
 
         return true;
     } catch (const std::exception& error) {
-        Logger logger = Logger::create_from_environment();
+        Logger logger = Logger::create_exception_logger();
         logger.log("Error during initialization:");
         logger.log(error.what());