Add TEMPLATEPATH, STYLESHEETPATH, and WP_DEFAULT_THEME constants

[westonruter]

See wp_templating_constants()

[szepeviktor]

I'd like to encourage core function usage.
Plugins rarely read these constants. So I do not merge this one.
Sorry.

[szepeviktor]

@westonruter Please see this disgusting package: https://github.com/php-stubs/wordpress-globals

[westonruter]

I'm not sure I would characterize usage as rare: https://wpdirectory.net/search/01GXJ8VAEHKDYT46ATAV25475Q

[szepeviktor]

Yes you are right.
I say using globals has no part in a software. But we have WordPress.
This is all I can offer.

If I would be a WordPress promoter, all core globals would be part of this project.

[westonruter]

I guess I misunderstood your motivations for this project.

[szepeviktor]

I've realized I should support the WordPress ecosystem even if I cannot tolerate its code quality.
Please see the What to avoid list https://github.com/szepeviktor/starter-plugin#what-to-avoid