Fake enums should not be exposed as globals

[TIMONz1535]

https://wiki.facepunch.com/gmod/Enums/NavTraverseType
https://wiki.facepunch.com/gmod/Enums/NavDir
https://wiki.facepunch.com/gmod/Enums/NavCorner
https://wiki.facepunch.com/gmod/Enums/AMMO
https://wiki.facepunch.com/gmod/Enums/GOALTYPE
https://wiki.facepunch.com/gmod/Enums/TEXTUREFLAGS
https://wiki.facepunch.com/gmod/Enums/SNDLVL

There is no tag to determine that they are fake, it's just a custom warning.

These enums should not be exposed as globals, we can

1. Remove globals from definition and leave only the main alias of enum with numbers, in case someone makes it as number{ENUM}.

---@alias NavDir 0 | 1 | 2 | 3

2. Make it completely aliases

--- North from given [CNavArea](https://wiki.facepunch.com/gmod/CNavArea)
---@alias NORTH 0
--- East from given [CNavArea](https://wiki.facepunch.com/gmod/CNavArea)
---@alias EAST 1
--- South from given [CNavArea](https://wiki.facepunch.com/gmod/CNavArea)
---@alias SOUTH 2
--- West from given [CNavArea](https://wiki.facepunch.com/gmod/CNavArea)
---@alias WEST 3

---@alias NavDir
---| NORTH
---| EAST
---| SOUTH
---| WEST

but again the weird comments display