TopBar

• filter buttons: used for switching between filters during training
• some statistics: discussed in chapter Statistics
• 'start'/'stop' button for toggling the training round state:
  • though "start" can be achieved via LMB click in GameArea or f key
• 'heatmap' button group: discussed in chapter Heatmap
• 'snap edit' button group: discussed in chapter Snap edit
• '?' ("Help") dropdown: used to open various windows and links
• "circled i" ("context info") button: already discussed in chapter Context info