[rcore] Add GetWindowPosition() implementation for PLATFORM_WEB and fixes #3636 style/format

[ghost]

Changes

1. Adds implementation for GetWindowPosition() that was missing for PLATFORM_WEB. Does that by using emscripten EM_ASM_INT and DOM window.screenX and window.screenY (R621-R625).

2. Fixes [rcore] Add GetMonitorWidth() and GetMonitorHeight() implementations for PLATFORM_WEB #3636 style/format to match the pattern generally used on raylib. Does that by changing w to width (R576-R578), h to height (R585-R587) and adding relevant notes (R575, R584). My apologies for missing the code style/convention on the previous PR.

Notes

• Returned position of GetWindowPosition() is relative to the current monitor where the browser window is located.

Code example

• This change can be tested for PLATFORM_WEB (requires ASYNCIFY) with:

#include "raylib.h"

int main(void) {
    InitWindow(800, 450, "test");
    SetTargetFPS(60);
    while (!WindowShouldClose()) {
        BeginDrawing();
        ClearBackground(RAYWHITE);
        DrawText(TextFormat("Window position: %f x %f", GetWindowPosition().x, GetWindowPosition().y), 20, 20, 20, BLACK);
        EndDrawing();
    }
    CloseWindow();
    return 0;
}

Environment

• Compiled on Linux (Ubuntu 22.04 64-bit) and tested on Firefox (115.3.1esr 64-bit) and Chromium (117.0.5938.149 64-bit) for both minshell.html and shell.html files.

Edits

• 1: added line marks, typo.

[raysan5]

@ubkp Nice! Thanks for the improvement! Actually, the w and h was something I wanted to comment, I prefer to avoid single-letter variables when possible, mostly for students reviewing the library. :)

[ghost]

@raysan5 Yeah, sorry about that. I was working on a different codebase which had a different code style and forgot to follow the code convention, my bad.