Resprite/consistency pass on all boots in boots.dmi (#20933)

Creative title, yeah. This is one of these PRs that had no joy involved
in making it.

Anyways, I just wanted to re-palette colorable boots, found unfathomable
sorcery in `boots.dmi`, and well, here we are. All boot sprites there
(but the winter boots because quite honestly it's a rather good sprite)
have been repaletted, resprited or tweaked. That includes: jackboots,
ridingboots, cavalryboots, all workboots, ALL colorable boots.

Select feet pics (in boots of course) of new sprites below:

<details>

jackboots (for cavalry and riding imagine these but longer):
<details>


![image](https://github.com/user-attachments/assets/1cf8124e-1ed5-496f-8da7-2e8e69b2848c)

</details>

brown workboots:
<details>


![image](https://github.com/user-attachments/assets/75b46edd-f849-4009-9785-5a8e0c4db93d)

</details>

grey workboots:
<details>


![image](https://github.com/user-attachments/assets/1d6f6c64-1b50-480e-825f-7849c46a124c)

</details>

dark workboots:
<details>


![image](https://github.com/user-attachments/assets/f29a1582-e211-4557-8077-1ce74838f36a)

</details>

out of the colorable boots, I picked the combat boots for showcase,
imagine these in various colors but they are currently pure white:

<details>


![image](https://github.com/user-attachments/assets/f0b5856b-e1b5-436d-95bb-5d4b01603d2c)

</details>

</details>



Attributions:
The jackboots (whose obj sprite was already ported some time ago, but
not the onmob sprite for some reason?) are from here:
https://github.com/tgstation/tgstation/pull/64863
The colorable mudboots are from here:
https://github.com/tgstation/tgstation/pull/73688
(Yes these are sprites for galoshes, but mudboots were/are just slightly
tweaked galoshes. Have actual galoshes been resprited in this PR? Nope!
Why? Couldn't be bothered + focused solely on the `boots.dmi` file,
maybe in a different PR.)

html/changelogs/ElorgRHG-just-boot-sprite-stuff.yml

@@ -0,0 +1,13 @@
+# Your name.
+author: ElorgRHG
+
+# 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: "Did a consistency pass, and some resprites, on most boot sprites, notable changes include: all colorable boots, all workboots, all jackboots/ridingboots/ridingboots."