NOPE. It's 26-35.

See the official bitcoin wiki - Address.

Are there any tutorials with code examples on Bitcoin Script: from basics to complex scripts?

All the images are located at /src/qt/res/
Just replace images located there with your owns

If you build a wallet on Linux or macOS, built binaries will be located at /usr/local/bin
There you can find bitcoind, bitcoin-cli, bitcoin-qt, ...

So after make and make install, run

You can just only transfer -qt file to your new OS and run it.

But it will be 100% woking only if you run
• the same version of OS
• on the same hardware
• with the same libs installed
If these options are not followed, there's a chance that you will have to recompile it (follow the steps provided by bob123).

You DEFINITELY can integrate such functionality for your LOCAL Bitcoin Core Wallet, but it's impossible for today to integrate such functionality to entire Bitcoin Blockchain, because it may break current consensus.

So, you can edit Bitcoin Core https://github.com/bitcoin/bitcoin, implement such functionality and even make pull request.

But these steps will setup sending limits only to your modernized local wallet. And if someone steal your private keys, he/she will be able to send all your coins from his/her ordinary wallet.