- transform global settings var into a singleton class
- add input validation to settings
- add type hinted getters for settings class
- translator will no longer load the same translation file more than
once
- argsURL function will now return NULL instead of empty string
- global settings variable now removed

- relative includes
- fix vendor include errors
- add debug info to api output if DEBUG env is set to a truthy value
- api output no longer escapes forward slashes making paths easier to read

- id refactor:
`$id` member of each DTO class will retain it's name to reflect DB
structure. Remote indexes are prefixed with table name in camel case. eg:
`$userId`, `$productId`, `$cinId` and so on. All extracted id's are also
prefixed with their table name unless they are dumped to client. eg:
`$userId = $user->id;` ~~`$id = $user->id;`~~

- fix minor typo that would not send a correct password to newly created
users.
- remove a dead function

- add router class
- refactor exception handling in routes
- remove globals
- add initial slack integration: log craches to slack

- add tests
- add robots.txt and .well-known/security.txt
- handle 403 as 404
- use frontend 404 code
- allow direct access to all files in public dir

Add a test member endpoint. written in Python just to make it quick.
Might want to transitions it to phpunit or some other php framework
later on when the api is finalized.