wry@0.38.0

e6f0fbd(#1180) Fixes a null pointer exception when running window.ipc.postMessage(null) on Android.
5789bf7(#1187) Breaking change: Refactored the file-drop handling on the webview for better representation of the actual drag and drop operation:
- Renamed file-drop cargo feature flag to drag-drop.
- Removed FileDropEvent enum and replaced with a new DragDropEvent enum.
- Renamed WebViewAttributes::file_drop_handler field to WebViewAttributes::drag_drop_handler.
- Renamed WebViewAttributes::with_file_drop_handler method to WebViewAttributes::with_drag_drop_handler.
b8fea39(#1183) Changed WebViewBuilder::with_ipc_handler closure to take http::Request instead of String so the request URL is available.
3a2026b(#1182) Breaking changes: Changed a few methods on WebView type to return a Result:
- Webview::url
- Webview::zoom
- Webview::load_url
- Webview::load_url_with_headers
- Webview::bounds
- Webview::set_bounds
- Webview::set_visible
- WebviewExtWindows::set_theme
- WebviewExtWindows::set_memory_usage_level
- WebviewExtWindows::reparent
- WebviewExtUnix::reparent
- WebviewExtMacOS::reparent
e1e2e07(#1190) Update webview2-com crate to 0.29
e1e2e07(#1190) Update windows crate to 0.54
00bc96d(#1179) Added WryActivity::onWebViewCreate(android.webkit.WebView) on Android.