Implement metronome feature with sound options and UI improvements (#4)

* Initial working metronome

* Add sounds with attribution

* Update metronome

* Improve metronome

* Metronome in upper right corner

* Remove plus and minus buttons

* Switch to Control

* Add icon

Author: brylie

app/assets/ATTRIBUTION.md

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+# Attribution
+
+The following resources were used in the creation of this project:
+
+## Sounds
+
+- [wood.wav](https://freesound.org/people/Druminfected/sounds/250552/) by Druminfected
+- [digital.wav](https://freesound.org/people/LudwigMueller/sounds/548519/) by LudwigMueller
+- [click.wav](https://freesound.org/people/xtrgamr/sounds/441644/) by xtrgamr
+- [bell.wav](https://freesound.org/people/unfa/sounds/243749/) by unfa

app/assets/images/metronome.svg

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+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://dfe64iy37i1al"
+path="res://.godot/imported/metronome.svg-6ebc65015c42ac6f1bc08220b30d5e72.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://assets/images/metronome.svg"
+dest_files=["res://.godot/imported/metronome.svg-6ebc65015c42ac6f1bc08220b30d5e72.ctex"]
+
+[params]
+
+compress/mode=0
+compress/high_quality=false
+compress/lossy_quality=0.7
+compress/hdr_compression=1
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=false
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=1
+svg/scale=1.0
+editor/scale_with_editor_scale=false
+editor/convert_colors_with_editor_theme=false

app/assets/images/metronome.svg.import

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+[remap]
+
+importer="wav"
+type="AudioStreamWAV"
+uid="uid://p5vc1at61fw6"
+path="res://.godot/imported/bell.wav-44c544e3bc2ecacf68643bf376bc940e.sample"
+
+[deps]
+
+source_file="res://assets/sound/bell.wav"
+dest_files=["res://.godot/imported/bell.wav-44c544e3bc2ecacf68643bf376bc940e.sample"]
+
+[params]
+
+force/8_bit=false
+force/mono=false
+force/max_rate=false
+force/max_rate_hz=44100
+edit/trim=false
+edit/normalize=false
+edit/loop_mode=0
+edit/loop_begin=0
+edit/loop_end=-1
+compress/mode=0

app/assets/sound/bell.wav

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+[remap]
+
+importer="wav"
+type="AudioStreamWAV"
+uid="uid://7imd0reh7i2h"
+path="res://.godot/imported/click.wav-e8a30ec71317fecc836e787d9d63b4a3.sample"
+
+[deps]
+
+source_file="res://assets/sound/click.wav"
+dest_files=["res://.godot/imported/click.wav-e8a30ec71317fecc836e787d9d63b4a3.sample"]
+
+[params]
+
+force/8_bit=false
+force/mono=false
+force/max_rate=false
+force/max_rate_hz=44100
+edit/trim=false
+edit/normalize=false
+edit/loop_mode=0
+edit/loop_begin=0
+edit/loop_end=-1
+compress/mode=0

app/assets/sound/bell.wav.import

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+[remap]
+
+importer="wav"
+type="AudioStreamWAV"
+uid="uid://ch513gii8byda"
+path="res://.godot/imported/digital.wav-3240fc317daf5a616f1cb6340a5cf8c7.sample"
+
+[deps]
+
+source_file="res://assets/sound/digital.wav"
+dest_files=["res://.godot/imported/digital.wav-3240fc317daf5a616f1cb6340a5cf8c7.sample"]
+
+[params]
+
+force/8_bit=false
+force/mono=false
+force/max_rate=false
+force/max_rate_hz=44100
+edit/trim=false
+edit/normalize=false
+edit/loop_mode=0
+edit/loop_begin=0
+edit/loop_end=-1
+compress/mode=0