Added dart board that the dart can get stuck too.

The prototype of the dart board was added to the main scene. Added and
area 3D to the dart board with the group dartable so that the added ray
on the end of the dart can collide with the board. Also added a button
to change camera angles using the c key. The dart only sticks to a
cylinder added to the board so there is no way to detect where and which
segment the dart's ray is currently stuck to.

Models/Dart/Dart_Wings-Default.png.import

@@ -3,7 +3,7 @@
 importer="texture"
 type="CompressedTexture2D"
 uid="uid://bqxi7x76uv4tq"
-path.s3tc="res://.godot/imported/Dart_Wings-Default.png-358040735cbc551a0d2abb04506c708a.s3tc.ctex"
+path.s3tc="res://.godot/imported/Dart_Wings-Default.png-40c0dfeb00a83025280623f0682c439a.s3tc.ctex"
 metadata={
 "imported_formats": ["s3tc_bptc"],
 "vram_texture": true
@@ -14,8 +14,8 @@ generator_parameters={
 
 [deps]
 
-source_file="res://Models/Dart/Dart_Wings-Default.png"
-dest_files=["res://.godot/imported/Dart_Wings-Default.png-358040735cbc551a0d2abb04506c708a.s3tc.ctex"]
+source_file="res://models/Dart/Dart_Wings-Default.png"
+dest_files=["res://.godot/imported/Dart_Wings-Default.png-40c0dfeb00a83025280623f0682c439a.s3tc.ctex"]
 
 [params]