Windows & Tabs refactoring: Remove Custom tabbing, implement native tabbed windows, rewrite app structure & hierarchy #changed

[Kaspik]

Changes:

• completely remove PSMTabBar
• start using native tabbedWindows architecture
• rewamp Main Menu actions
• simplify hierarchy for AppController => Window => Window Controller => Database document

Closes following issues:

• Closes: Window tab bar implementation click and drag problems #896
• Closes: please add a preference to hide tab bar #929
• Maybe: Freeze when window maximized or restored  #857
• Maybe: Toolbar UI issue with multiple monitors #847
• Maybe: Running query in one window/tabs checks for connectivity status of other windows/tabs #282
• Maybe: Crashes when opening multiple tabs quickly #905

Tested:

• Processors:
  • Intel
  • Apple Silicon
• macOS Versions:
  • 10.12.x (Sierra)
  • 10.13.x (High Sierra)
  • 10.14.x (Mojave)
  • 10.15.x (Catalina)
  • 11.x (Big Sur)
• Localizations:
  • English
  • Spanish
  • Other (please specify)
• Xcode Version: 12.4

Screenshots:

Default

Option to hide tab bar when there is only on tab:

Multiple tabs, favorite color:

SSL connection:

NEW - all native stuff, like show all tabs:

Additional notes:

Opening this PR now as it seems like it's good for internal testing. All issues found should be added to the created project and I'll prioritize them as it comes. I'm pretty sure there are and there will be bugs, but I don't think I'm able to find them all.

EVERYTHING was reviewed by sub-PRs by @Jason-Morcos , so this review should be easier to do if you even want to do a review instead of just quick sanity check.

[Jason-Morcos]

Awesome work!
Any way we could make the tab color more clear for tabs? A little more like the old way if possible? At the minimum, maybe changing the color of the tab title at least?

[samuelbradshaw]

I like the smaller color indicator, and might start using colors now for my favorites. :) When the full tab is colored, it makes it hard to tell which tab is currently selected, and it doesn't look as "native."

[Kaspik]

Yes and no. You can make it whatever size you want, but it would be above the title. Making it bigger after the title means possible conflicts with longer titles... Making it 4:1 with sharp corners is ugly, with rounded corners it's weird... so circle it is for now. 😄 We might tweak the colors!