Feature/multi qr code reader

[odahcam]

• Added support for multiple QR code scanning from the same image.
• Added tests for the feature.
• Updated some classes this feature depends on.
• Updated Sharp.

[Swiftwork]

Based on comments in the UPCEAN Pull-Request discussion this is where we land I think

constructor(arg1: any);
constructor(arg1: any, arg2: any);
constructor(arg1: any, arg2: any, arg3: any);
constructor(arg1: any, arg2?: any, arg3?: any) {
    if (arg2 == null) arg2 = {};
    if (arg3 == null) arg3 = {};
    return constructorImpl(arg1, arg2, arg3)
}

constructorImpl(arg1: any, arg2: any, arg3: any) {
    /* Implementation code */
}

and less preferred if more advanced logic needed

constructor(arg1: any);
constructor(arg1: any, arg2: any);
constructor(arg1: any, arg2: any, arg3: any);
constructor(arg1: any, arg2?: any, arg3?: any) {
    if (arg3 != null) return constructorImpl(arg1, arg2, arg3);
    if (arg2 != null) return constructorOverload2(arg1, arg2);
    return constructorOverload1(arg1)
}

private constructorOverload1(
    arg1: any,
) {
    return this.constructorOverload2(arg1, {});
}

private constructorOverload2(
    arg1: any,
    arg2: any,
) {
    return this.constructorImpl(arg1, arg2, {});
}

private constructorImpl(
    arg1: any,
    arg2: any,
    arg3: any,
) {
    /* Implementation code */
}

[odahcam]

What massive error I did merging master onto this branch.

[itome]

Any updates in this PR? I'm trying to use this branch in my project and hope this branch will be merged into master.

[Donhv]

i love this PR.

[shahrin014]

Also bumping this PR. Let me know how I can help.

[shahrin014]

I made some minor fixes and created PR https://github.com/zxing-js/library/pull/464 to merge into feature/multi-qr-code-reader. Maybe you can merge that before merging this branch to master.