Rename attacks to initial access

[kkneomis]

In the configs, we define several "attack types" that are used in the game
These "attacks" define the first actions taken by adversaries that kick off a long chain of events
In realities - "attacks" simply represent initial access vectors".
We should rename them as such and strike to map the yaml definitions as closely as we can the MITRE ATT&CK framework categories.

actor.yaml

attacks:
  - recon:browsing
  - email:malware_delivery

Should be

initial_access:
  - recon:browsing
  - email:malware_delivery

app > server > utils.py

class AttackTypes(Enum):
    """
    An enum to describe types of attacks that cna be conducted by an actor
    """
    PHISHING_VIA_EMAIL              = "email:phishing"
    MALWARE_VIA_EMAIL               = "email:malware_delivery"
    SUPPLY_CHAIN_VIA_EMAIL          = "delivery:supply_chain"
    PASSWORD_SPRAY                  = "identity:password_spray"
    RECONNAISSANCE_VIA_BROWSING     = "recon:browsing"
    MALWARE_VIA_WATERING_HOLE       = "watering_hole:malware_delivery"
    PHISHING_VIA_WATERING_HOLE      = "watering_hole:phishing"

should be

class InitialAccess(Enum):
    """
    An enum to describe initial access vectors that can be conducted by an actor
    """

`app > server > game_functions.py`
```python
        # Send emails
        if AttackTypes.PHISHING_VIA_EMAIL.value in actor.get_attacks()\
        or AttackTypes.MALWARE_VIA_EMAIL.value in actor.get_attacks():
            gen_actor_email(employees,
                      actor, 
                      start_date=current_date
            )

should be

        # Send emails
        if InitialAccess.PHISHING_VIA_EMAIL.value in actor.get_attacks()\
        or InitialAccess.MALWARE_VIA_EMAIL.value in actor.get_attacks():
            gen_actor_email(employees,
                      actor, 
                      start_date=current_date
            )