Add CiviCase option for showing case activities in normal views

Add CiviCase option for showing case activities in normal views

Different aproach to tackling #16353

Fix array-to-string notice; Improve activity action links

remove upgrader - as per Pradeep's suggestion

update version added

tweak way description is gotten

update activity tests to check civicaseShowCaseActivities setting

Fix another array-to-string conversion error

Remove File On Case from activity View; add Manage Case

fix case activity links when using caseShowCaseActivities

remove ctx parameter for case activity links

various

US-Englishized Case settings texts.

fix permission name