Updates Sprites: Safes & Girders (#21224)

## About PR
Updates the girders and safes/wall safes to not use sprites from
probably 1999 anymore. The girders now take our not-so-new 3/4th
perspective into account.
They have been ported from Shiptest and modified by me. Below are the
new sprites. Please enjoy.

> <img width="328" height="97" alt="image"
src="https://github.com/user-attachments/assets/495f1ed0-99d9-41da-a4ae-35560bccb0bf"
/>
> <img width="872" height="106" alt="image"
src="https://github.com/user-attachments/assets/f00b4b69-26cf-40ea-b5bc-807edca12e87"
/>


### Asset Licenses
The following assets that **have not** been created by myself are
included in this PR:

| Path | Original Author | License |
| --- | --- | --- |
| icons/obj/structures.dmi (girder) | nefarious (Shiptest) | APGL-3.0  |
| icons/obj/structures.dmi (safe)| Any% (Shiptest) | APGL-3.0  |

html/changelogs/KingOfThePing - new_safe_new_girders.yml

@@ -0,0 +1,59 @@
+################################
+# Example Changelog File
+#
+# Note: This file, and files beginning with ".", and files that don't end in ".yml" will not be read. If you change this file, you will look really dumb.
+#
+# Your changelog will be merged with a master changelog. (New stuff added only, and only on the date entry for the day it was merged.)
+# When it is, any changes listed below will disappear.
+#
+# Valid Prefixes:
+#   bugfix
+#     - (fixes bugs)
+#   wip
+#     - (work in progress)
+#   qol
+#     - (quality of life)
+#   soundadd
+#     - (adds a sound)
+#   sounddel
+#     - (removes a sound)
+#   rscadd
+#     - (adds a feature)
+#   rscdel
+#     - (removes a feature)
+#   imageadd
+#     - (adds an image or sprite)
+#   imagedel
+#     - (removes an image or sprite)
+#   spellcheck
+#     - (fixes spelling or grammar)
+#   experiment
+#     - (experimental change)
+#   balance
+#     - (balance changes)
+#   code_imp
+#     - (misc internal code change)
+#   refactor
+#     - (refactors code)
+#   config
+#     - (makes a change to the config files)
+#   admin
+#     - (makes changes to administrator tools)
+#   server
+#     - (miscellaneous changes to server)
+#################################
+
+# Your name.
+author: KingOfThePing
+
+# Optional: Remove this file after generating master changelog.  Useful for PR changelogs that won't get used again.
+delete-after: True
+
+# Any changes you've made.  See valid prefix list above.
+# INDENT WITH TWO SPACES.  NOT TABS.  SPACES.
+# SCREW THIS UP AND IT WON'T WORK.
+# Also, this gets changed to [] after reading.  Just remove the brackets when you add new shit.
+# Please surround your changes in  double quotes ("). It works without them, but if you use certain characters it screws up compiling. The quotes will not show up in the changelog.
+changes:
+  - imageadd: "Updated girders to work better with the 3/4th walls."
+  - imageadd: "Updated safe.dmi to not use sprites from the stone age anymore."