Add functionality to future_pto_calc, remove calendar_conflict step from goal

tools/data/employee_pto_data.json

@@ -1,17 +1,16 @@
 {
   "theCompany": {
     "weLove": "theCompany", 
-    "accrualPer": "month",
     "employees": [
       {
         "email": "josh.smith@temporal.io",
         "currentPTOHrs": 400,
-        "accrualHrsRate": 8
+        "hrsAddedPerMonth": 8
       },
       {
         "email": "laine.smith@awesome.com",
         "currentPTOHrs": 40,
-        "accrualHrsRate": 12
+        "hrsAddedPerMonth": 12
       }
     ]
   }