fix(deprecation): deprecation warnings for 1.10 now work as expected

The previous code would cause "1.10" to be interpreted as version 1.1
chore(entities): removes unused var in entity delete
deprecate(plugins): formally deprecates use of $CONFIG in start.php
Merge pull request #7213 from mrclay/7205

chore(entities): removes unused var in entity delete
Merge pull request #7211 from mrclay/plugin_boot

Deprecates use of $CONFIG in plugin start.php