Studio Headless Mode (#36)

This PR adds the capaibility to run Stroyteller studio from the command
line, rendering the result to images. This is the basic functionality,
and there are somethings that I am saving for later when we make this a
more fully fledged feature.

Limitations:
- Right now, you cannot do image output resolutions that aren't 2^n.
This is a bug I plan on tackling later.

If you have questions on how the command line works, use the --help
argument.

Let me know what you think!

---------

Co-authored-by: Danny McGee <dannymcgee@gmail.com>

studio/project.json

@@ -14,6 +14,10 @@
         "release": false
       },
       "configurations": {
+        "headless" : {
+          "release" : true,
+          "bin": "studio-headless"
+        },
         "production": {
           "release": true
         }
@@ -34,6 +38,12 @@
         "bin": "studio-standalone"
       }
     },
+    "headless": {
+      "executor": "nx:run-commands",
+      "options": {
+        "command": "cargo run -p studio --bin studio-headless -- {args}",
+      }      
+    },
     "test": {
       "executor": "@nxrs/cargo:test",
       "options": {}