Minor fixes and improvement to Flavor Text (shiptest-ss13#2952)

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Improves and fixes issues where flavor text would sanitize certain
characters and refuse new lines while also giving new looks to the
flavor text page. Bits of codes for the popup was taken from
MapleStation but I can't find the specific PR for it.

Flavor text's length was also chopped from a whooping 4096 to 1024 for
the sake of keeping it lag free, it should still allow you to make a
pretty robust flavor text and it shouldn't really impact anyone as the
average flavor text length I've seen on a round was around 362
characters, with the highest being 645 characters.

![dreamseeker_RBS1nF48VM](https://github.com/shiptest-ss13/Shiptest/assets/66234359/8b541cf1-c51f-4893-b388-fe01b6f413fc)

Additionally changes the text a bit on the flavor text's edit popup so
it leads to less confusion.

I'm intending to do a full refactor for flavor text itself and hopefully
make use of TGUI but this might take quite a bit and I can't really make
any guarantees, so hopefully this helps for now.

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Flavor text has been buggy and limiting for quite a while, while this PR
doesn't solve many code shenanigans it should at least help people
describe how their characters a lot better and with less wall of texts.

As for the text changes; I believe this might make more sense and
hopefully lead to less confusion that I'd see some have when it comes to
flavor text.

:cl: Hardly
add: Added some style to the flavor text popup
fix: Fixed flavor text not accepting certain characters or new lines
tweak: Changed up Flavor Text editing text a bit
tweak: Flavor text's max length has been chopped from 4096 to 1024
/:cl:

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Co-authored-by: FalloutFalcon <[email protected]>

check_regex.yaml

@@ -38,7 +38,7 @@ standards:
 
     - exactly:
           [
-              265,
+              268,
               "non-bitwise << uses",
               '(?<!\d)(?<!\d\s)(?<!<)<<(?!=|\s\d|\d|<|\/)',
           ]