Improve wasapi backend UWP support (#853)

* Improve wasapi, support uwp build

* Fix compile errors

* [UWP] Support ReadALConfig from app roaming

* [UWP] Post disconnect event when default device changed

* [UWP] Fix appveyor ci

* [WIN32] Default device change notification support

* Fix warnings

* Add event to notify the app when the default device changes

- Event type: AL_EVENT_TYPE_DEFAULT_DEVICE_CHANGED_SOFT=0x19A7
- Event callback parameters:
  void _onALSoftEvent(ALenum eventType,
                    ALuint object, // dataFlow: 0(render), 1(capture)
                    ALuint param, // 0
                    ALsizei length, // 0
                    const ALchar* message, // Default device changed:<deviceId>
                    void* userParam);

* Fix warnings

* Fire default device changed event in mixerProc thread

* Fix compile warning

* [UWP] Improve cmake

* Revert changes

* Notify default device change by system event callback

* Revert insignificant change

* Remove duplicate call

1 files changed, 2 insertions, 2 deletions

diff --git a/router/router.cpp b/router/router.cpp
index 3c891053..18ecf9b4 100644
--- a/router/router.cpp
+++ b/router/router.cpp
@@ -334,7 +334,7 @@ void LoadDriverList(void)
         TRACE("Got DLL path %ls\n", dll_path);
 
     GetCurrentDirectoryW(MAX_PATH, cwd_path);
-    len = lstrlenW(cwd_path);
+    len = wcslen(cwd_path);
     if(len > 0 && (cwd_path[len-1] == '\\' || cwd_path[len-1] == '/'))
         cwd_path[len-1] = '\0';
     TRACE("Got current working directory %ls\n", cwd_path);
@@ -343,7 +343,7 @@ void LoadDriverList(void)
         TRACE("Got proc path %ls\n", proc_path);
 
     GetSystemDirectoryW(sys_path, MAX_PATH);
-    len = lstrlenW(sys_path);
+    len = wcslen(sys_path);
     if(len > 0 && (sys_path[len-1] == '\\' || sys_path[len-1] == '/'))
         sys_path[len-1] = '\0';
     TRACE("Got system path %ls\n", sys_path);