Bug fixes

Changes since 8.x-1.0-beta3:

• #2989437 by jsacksick: Send the "SKU" as the "itemCode".
• #2841679 by jsacksick: Exclude tax adjustments from the adjusted total.
• Minor code adjustments.

The 8.x-3.0-alpha2 provides resolution for the following issues:
#2989183: Fast Purge URLs Without Hostname
#2979939: Support "path" purge type in purger plugin

Changes since 8.x-1.0-beta2:

Changes since 8.x-1.0-alpha1:

• Fixed processing of the cache expire in Cdek::setCacheData(). Fixed some typos.
• Added cdek_api cache bin.
• Changing the values of some install settings. Fixed processing of the cache expire in Cdek::isCached() and AdvancedSettingsForm::buildForm().
• UI for clearing the CDEK API cache.