Janitorial: handle deprecation of TEMPLATEPATH and STYLESHEETPATH

[jeherve]

The TEMPLATEPATH and STYLESHEETPATH constants have been deprecated. get_template_directory() and get_stylesheet_directory() should be used instead.
-- https://core.trac.wordpress.org/ticket/18298

In Jetpack CRM

jetpack/projects/plugins/crm/includes/jpcrm-templating.php

Line 218 in 413617e

'path' => TEMPLATEPATH . '/' . $zbs->template_path . '/'

jetpack/projects/plugins/crm/includes/jpcrm-templating.php

Line 214 in 413617e

'path' => STYLESHEETPATH . '/' . $zbs->template_path . '/'

In Jetpack

jetpack/projects/plugins/jetpack/class.json-api-endpoints.php

Line 1894 in eb7ffd7

if ( false === defined( 'STYLESHEETPATH' ) ) {

jetpack/projects/plugins/jetpack/json-endpoints/class.wpcom-json-api-render-endpoint.php

Line 24 in f121662

if ( false === defined( 'STYLESHEETPATH' ) ) {

---

Primary issue: #32865

[jeherve]

@Automattic/avengers Is that something you could look at for the CRM plugin?

Thank you!

[jeherve]

@david-binda I'd like to have your take on this.

Related conversation: p7H4VZ-2F7-p2
This eventually led to D51494-code, which was ported to Jetpack in #17563.

I'm thinking that now that r56635 happened, we could completely revert that hot fix?

What do you think? What's your timeline on porting those changes from Core to wpcom?

[jeherve]

@david-binda Did you have the chance to look at this?

Thank you!