Remove pre-ATT&CK domain

[isaisabel]

With the next release of ATT&CK, the pre-ATT&CK domain is being migrated into new tactics under the enterprise domain. Therefore the pre-ATT&CK domain itself should be removed from the application. This also means that the "stages" (prepare/act) section of the filters and layer format may be removed.

To replicate the prior functionality of the stages filters, we may want to introduce the following feature to the context menu:

• select/deselect all techniques in a tactic. This will allow users to easily select the new tactics in order to hide the pre-ATT&CK techniques using the existing disable/hide workflow.