tools: hs visualizer

[maotovisk]

Issue tracker for remaining features of the hitsound visualizer.

Features:

• HS timeline (draft: implement hs visualizer #29)
• Audio Stuff (Bass) (draft: implement hs visualizer #29)
• Fix samples being louder when playing alone. (draft: implement hs visualizer #29)
• Doublecheck timing and offset alignment on the timeline (feat: improve time precision by using local double values #7 - still ongoing)
• Bookmark Visualizers
  • Allow us to select entire sections based on bookmarks
• Editing flow
  • Tighten Keybindings (ctrl/shift +(or) [q]wer - same hs keybindings as osu!) (draft: implement hs visualizer #29)
  • Fix Clipboard Workflow (draft: implement hs visualizer #29)
  • Edit history (undo, redo) (draft: implement hs visualizer #29)
  • Volume editor
  • Export to (new diff, selected diff) (feat: add export capabilities to hitsound visualizer #33)
  • HS Selector (draft: implement hs visualizer #29)
  • Pattern Generator (for drums - like fl studio)
• Add a way to mute the playback of a row