supply crate edit

Crates vs. Cases
Added a more solid description of how to identify what is a crate vs what is a case.


Using Keys
Split into two paragraphs so crate and case were more separated
Clarity on the exceptions
Price info was unneeded


Graded Items
The statement about similar odds for each item in a crate is pretty clearly false for most crates (see retired crate series page)
1% unusual rate is known to be false for years now, one source is on the unusual page, my personal unbox data is somewhere


Unboxing Unusuals
Split into two sections to clarify the unusual effect info added
Added info about the unusual effects each type gives for completeness on the difference between crate/case
Moved the info from Limited Time Offers section up here and gave it a major rewording
Unusual misc info - https://pastebin.com/HEVheSg5


War Paints
Clarified that the weapon skin cases are also in this category
Also added info about the contract cases, I'm pretty sure this is how those odds work (similar to Tough Break which doesn't have an elite grade) but unlike tough break I don't have the data to back this up.
1% unusual rate change again


Limited Time Offers
Sort-of moved this info up
Specifically mentioning 2018 wasn't necessary and mentioning the public confusion is not really fitting on the wiki afaik