[woahwhattheheck]

Companion implementation for nwjs/nw.js#8390, which supplies the nw.js manifest, documentation and sanity tests. Implements the window.splash manifest field requested in nwjs/nw.js#151.

window.splash is the path/URL of a page or image, or {url, width, height, min_duration, transparent}. When it is set, nwjs/newwin.js (NW2) and nwjs/default.js (NW1):

• open a frameless, centered, always-on-top splash window that is not in the taskbar (an image without a size is sized to the image; otherwise 400x300)
• create the main window hidden
• once the main window has loaded (the same signal as the loaded event) and min_duration ms have passed, show the main window (unless show is false) and close the splash
• close the splash if the main window is closed or fails to be created; if the splash fails, the main window is shown on load as usual

Without window.splash both scripts make exactly the same window calls as before.

Scope and validation: This splash starts after the application package has been read and covers main-window loading. It does not yet cover archive extraction, which the reporter also requested in #151. The two bootstrap scripts passed 18 mocked VM checks and syntax checks in the original engineering run. The three-line C++ change was not compiled, and the two sanity tests were not run in an NW.js runtime. No full build or broad suite is claimed.

This is the companion contribution to the funded IssueHunt #151 bounty; the reward claim will be registered with the linked nw.js PR under @woahwhattheheck.

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