Replace GIF icons with SVGs in example.navigator project

[vogella]

• Copied delete_obj.svg, filenav_nav.svg, and prop_ps.svg from workbench bundles.
• Updated plugin.xml to reference the new SVG icons.
• Removed the original GIF files.
• Updated build.properties to include the icons directory in the binary build.

[github-actions]

Test Results

 3 024 files  + 54   3 024 suites  +54   2h 25m 46s ⏱️ +20s
 8 234 tests ±  0   7 986 ✅ ±  0  248 💤 ± 0  0 ❌ ±0 
23 526 runs  +170  22 735 ✅ +114  791 💤 +56  0 ❌ ±0 

Results for commit 42da72a. ± Comparison against base commit 676351a.

♻️ This comment has been updated with latest results.

[BeckerWdf]

but (at least some) icons are completely different. Is that by intention?

[vogella]

but (at least some) icons are completely different. Is that by intention?

I searched for fitting icons with the same name, as these are examples and are not visible in an Eclipse installation I did not care too much if some of them look different.

[BeckerWdf]

can we get a before vs. after screenshot

[vogella]

can we get a before vs. after screenshot

Sure, I will split the PR into individual PR per project and add before and after screenshos.
I will do this after the freeze, not time critical as the current gifs have been ugly since a decade on a darker background.