* Move sub-module templates in their own `views` folder

By using `getTemplate()` we can specify which sub-module a template is
related to, enabling this behavior.
The templates names were shortened by stripping the name of their
sub-module from it since they are stored under their sub-module folder.
String templates are created using `getTemplate()` instead of
`monster.template()` that we are trying to depreciate.

* Only use `getTemplate()` for both regular and string templates

* Allow toggle via config between two caller id selection methods

This only affects caller ID for users. If
monster.config.whitelabel.allowAnyOwnedNumberAsCallerID is falsy, the
old way of assigning caller ID will be activated i.e. users can only
have their caller ID set to numbers assigned to them, otherwise the main
number is used. If monster.config.whitelabel.allowAnyOwnedNumberAsCallerID
is truthy, the user can also have any number owned by the account used as
their caller ID.

* Add automatic eslint fixes

* Eslint fix: make mixed user of && and || tidier