template coding standard fixes
Fix _wc_session_expires autoloading
Merge pull request #5290 from splashingpixels/templates

template coding standard fixes
Remove nonce from comment form to prevent issues with caching
reset grouped products correctly to work with short codes
Fix dashboard styles, and remove non-used styles
get_image_id method + use in email template

Closes #5288
Merge pull request #5292 from kloon/fix-session-autoloading

Fix _wc_session_expires autoloading
Tweak reports query generator to reference table names

Fixes #5278
[2.2] Merge ship to billing and billing only options

+ update options, update files to use new option + function Closes #5284
[2.2] Missed one file for #5284