Overhaul action states and add icons to toolbar

[droidmonkey]

• Fixes Going to application settings and back to entry view disables several context menu items #10981

Screenshots

Testing strategy

Added unit tests and tested extensively manually

Type of change

• ✅ Bug fix (non-breaking change that fixes an issue)
• ✅ New feature (change that adds functionality)

[varjolintu]

Something I noticed while debugging:
https://github.com/keepassxreboot/keepassxc/blob/develop/src/gui/EntryPreviewWidget.cpp#L544 This is constantly updated even if the config setting has disabled showing the TOTP in the Preview Panel.

EDIT: Maybe the whole Preview Panel shouldn't get updated if it's not even visible.

[michaelk83]

Consider grouping the new Database Settings toolbar icon into the existing Settings icon, with a dropdown. And in that case, you can remove the separator between the Passkeys and Password Generator, since these icons can be considered as just four tools: passkeys, reports, generator, settings.

[codecov]

Codecov Report

Attention: Patch coverage is 94.28571% with 10 lines in your changes missing coverage. Please review.

Project coverage is 63.32%. Comparing base (ea2e36c) to head (88a98ef).
Report is 31 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/gui/reports/ReportsDialog.cpp	0.00%	6 Missing ⚠️
src/gui/DatabaseTabWidget.cpp	77.78%	2 Missing ⚠️
src/fdosecrets/objects/Service.cpp	0.00%	1 Missing ⚠️
src/gui/DatabaseWidget.cpp	96.43%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #11047      +/-   ##
===========================================
+ Coverage    62.98%   63.32%   +0.34%     
===========================================
  Files          362      362              
  Lines        37793    37739      -54     
===========================================
+ Hits         23802    23895      +93     
+ Misses       13991    13844     -147     

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[droidmonkey]

@phoerious this is ready for review

[varjolintu]

At first I was wondering why returning Application Settings or Password Generator activates the previous state (Database Reports / Database Settings / main view), but these are different states in the main view vs. different widgets. So after all it's just logical and works as expected.

[droidmonkey]

Yah that is confusing when you only have one database open since everything looks the same, but when you have more than one open the tabs disappear when in the password generator and application settings.