Feat: Implement dynamic theming and Dark Mode support

[brtnfld]

Introduces a centralized ThemeManager to handle application-wide color
schemes, supporting Light, Dark, and System (Auto) modes.

Key changes:
- Added ThemeManager and ThemeChangeListener for dynamic UI updates.
- Refactored Chart and TableView to use theme colors and update
  instantly without application restart.
- Implemented robust SWT resource disposal to prevent handle leaks.
- Updated User Options dialog to allow manual theme selection.
- Added Info-plist.template for macOS packaging support.

---

Important

Introduces ThemeManager for dynamic theming, updating Chart, DefaultBaseTableView, and UserOptionsGeneralPage to support Light, Dark, and System modes.

• Behavior:
  • Introduces ThemeManager for centralized theme management, supporting Light, Dark, and System modes.
  • Implements ThemeChangeListener interface for dynamic theme updates in Chart and DefaultBaseTableView.
  • Updates UserOptionsGeneralPage to allow manual theme selection and apply changes immediately.
• Components:
  • Chart and DefaultBaseTableView now register as ThemeChangeListener to update UI dynamically.
  • ThemeManager manages theme preferences and notifies listeners of changes.
• Misc:
  • Adds themePreference to ViewProperties for storing user theme settings.
  • Implements robust SWT resource disposal in Chart to prevent handle leaks.
  • Adds Info-plist.template for macOS packaging support.

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[mattjala]

Does this supercede #452?

I think this should be pushed until after the 3.4.0 release, since it's a purely visual change.

[brtnfld]

Yes, it supercedes #452 as it is a better way to fix the dark mode issues on Macs.

[brtnfld]

I'm also fine with #452, going in instead.

[brtnfld]

Does not fix the dark mode issues on mac.