Sergey Biryukov f0e9ffdebb Plugins: When validating plugin's WordPress and PHP requirements, check for Requires at least and Requires PHP headers in the plugin's main PHP file.
This allows for blocking plugin activation if it requires a higher version of PHP or WordPress, and does not have a `readme.txt` file.

If the headers are defined in both `readme.txt` and the main plugin file, precedence is given to the plugin file.

Props afragen, Otto42, Ipstenu.
Fixes #46938.
Built from https://develop.svn.wordpress.org/trunk@45546


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