feat: Oscillator GUI (#9)

Waveshape and volume implemented. Added Signal drawing

Todo: explore possibility to separate ui and applying state changes

Co-authored-by: HiveBeats <e1lama@protonmail.com>
Reviewed-on: #9

.vscode/settings.json

@@ -3,7 +3,11 @@
         "readability/casting"
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     "files.associations": {
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+        "algorithm": "c",
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+        "bitset": "c",
+        "chrono": "c",
+        "unordered_map": "c"
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     "FSharp.suggestGitignore": false,
 }