Fix missing placement for STL & STEP Files (#600)

* Fix missing placement for STL & STEP Files

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: arjxn-py

python/jupytercad_core/src/stepplugin/model.ts

@@ -43,7 +43,13 @@ export class JupyterCadStepDoc extends JupyterCadDoc {
         shape: 'Part::Any',
         parameters: {
           Content: this._source.toJSON(),
-          Type: 'STEP'
+          Type: 'STEP',
+          Color: '#808080',
+          Placement: {
+            Angle: 0.0,
+            Axis: [0.0, 0.0, 1.0],
+            Position: [0.0, 0.0, 0.0]
+          }
         }
       }
     ];

python/jupytercad_core/src/stlplugin/model.ts

@@ -43,7 +43,13 @@ export class JupyterCadStlDoc extends JupyterCadDoc {
         shape: 'Part::Any',
         parameters: {
           Content: this._source.toJSON(),
-          Type: 'STL'
+          Type: 'STL',
+          Color: '#808080',
+          Placement: {
+            Angle: 0.0,
+            Axis: [0.0, 0.0, 1.0],
+            Position: [0.0, 0.0, 0.0]
+          }
         }
       }
     ];