test: modernize mocha config (#155)

Author: JustinBeckwith

core/projectify/.mocharc.json

@@ -0,0 +1,5 @@
+{
+  "enable-source-maps": true,
+  "throw-deprecation": true,
+  "timeout": 10000
+}

core/projectify/package.json

@@ -33,11 +33,8 @@
     "@types/node": "^10.5.2",
     "codecov": "^3.0.4",
     "gts": "^1.0.0",
-    "hard-rejection": "^2.0.0",
-    "intelli-espower-loader": "^1.0.1",
     "mocha": "^7.0.0",
     "c8": "^7.0.0",
-    "source-map-support": "^0.5.6",
     "typescript": "3.6.4",
     "linkinator": "^1.5.0"
   },