Friendly syntax for Intellisense (#3577)
Friendly syntax for Intellisense (#3577)

Dynamic code declaration is not well detected, especially for constants, so change to more standard syntax, which is correctly detected by Intellisense / Intelephense.

Furthermore, thins custom `safe_define()` function has been confusing for some users, e.g. https://github.com/FreshRSS/FreshRSS/issues/2723#issuecomment-753318513
aledeg/FreshRSS,FreshRSS/FreshRSS,Alkarex/FreshRSS,aledeg/FreshRSS,Alkarex/FreshRSS,Alkarex/FreshRSS,FreshRSS/FreshRSS,Alkarex/FreshRSS,aledeg/FreshRSS,aledeg/FreshRSS,FreshRSS/FreshRSS,FreshRSS/FreshRSS