Several fixes

What have you done in this MR?

• Changed NPC spawn positions - #1224
  • I looked for "flesh crawler id 4390 zombie id 4392" but could not find them, i could however find a whole lot of NPC's stuck on wrong levels within GWD that adds up to the second point mentioned in issue 1224.
• Changed stock - #1223
  • ~~Ranging guild ticket exchange is now showing the correct amount of stock. Used ~~~~~~~~~~~~https://runescape.wiki/w/Ranging_Guild_Ticket_Exchange?oldid=22414057~~~~\~\~\~\~~~~~ next to the screenshots that were attached to the issue.~~
• Fixed ladder/stairs to their correct locations. Only thing i experienced is that sometimes the player doesn't enter the stairs on the correct side, (i.e, stairs are pointing west, player enters them east, so the back of the stairs)
  • fixes #1430 (closed), #1499 (closed), #1272 (closed), #1206 (closed)

Are there any tricky things testers should keep an eye out for?

• No
• Yes, as follows:
• I have tested these changes thoroughly.
• This requires extra testing due to changes to architecture or other similarly risky changes.
• I used the Thanos Tool for any JSON edits where possible, and have attached screenshots of any changes. - Used Visual Studio Code to check for invalidities.
• I acknowledge that this contribution will be released under the AGPL license.

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