Move everything configuration related to plugin

If it's tied to the .so file rather than the .dll file it wouldn't make
any sense to use it directly from the Wine host.

meson.build

@@ -63,6 +63,7 @@ shared_library(
   [
     'src/common/logging.cpp',
     'src/common/serialization.cpp',
+    'src/plugin/configuration.cpp',
     'src/plugin/plugin.cpp',
     'src/plugin/plugin-bridge.cpp',
     'src/plugin/utils.cpp',

src/plugin/utils.cpp

@@ -28,7 +28,7 @@
 // Generated inside of build directory
 #include <src/common/config/config.h>
 
-#include <../common/configuration.h>
+#include "configuration.h"
 
 namespace bp = boost::process;
 namespace fs = boost::filesystem;