Save/restore camera views

[davreev]

Adds commands for getting/setting the default camera view. Required by engine PR 3121.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 18 lines in your changes missing coverage. Please review.

Please upload report for BASE (main@c8ba999). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
modeling-cmds/src/shared.rs	0.00%	14 Missing ⚠️
modeling-cmds/src/def_enum.rs	0.00%	4 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #782   +/-   ##
=======================================
  Coverage        ?   24.64%           
=======================================
  Files           ?       36           
  Lines           ?     2155           
  Branches        ?        0           
=======================================
  Hits            ?      531           
  Misses          ?     1624           
  Partials        ?        0           

Flag	Coverage Δ
unittests	24.64% <0.00%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[adamchalmers]

I think this should use our dedicated Point type, because it's not just 3 arbitrary number, it represents a specific point in space, right?

Suggested change

	pub pivot_position: [f32; 3],
	pub pivot_position: Point3d<f32>,

[davreev]

I was avoiding it here since this type passes through an FFI boundary and Point3d isn't repr(C).

I might be erring on the side of caution unnecessarily though - is it ok to have non repr(C) fields in a repr(C) struct? Will follow up with another PR if so.