Separate crosshair for pistol+shotgun and hipfire + unit tests

[nullsystem]

Description

Removed hipfire convar and now part of crosshair bit-flag in serialization. Separate crosshair for secondary/pistols and shotguns, the others (SMGs, rifles, and machine guns) only for default crosshair. Grenades, knife, and snipers never gets the normal crosshair.

NeoUI added in ringbox-flags, similar to ringbox-bool but for flags rather than bools.

Serialization to/from string now saving bytes by omiting values same as their default counterpart and doing run-length encoding on empty segments.

Add further sanity checking, import limits to the defined bounds, validator also checks the bounds and utilized when cl_neo_crosshair set directly.

Added in unit testing, for crosshair and just-serialization functionalities.

DONE:

• Compress non-default by default crosshair
• Run-length encode multiple empty ;;
• NeoUI - Replace "reverse bool labels" with custom 2-size labels
• Maybe more general enum for weapon types
• Unit test serialization cross versions + compression, and some functions
• Check longest possible serialization string

Toolchain

• Linux GCC Distro Native Arch Linux/GCC 15

Linked Issues

• fixes [FEATURE] Custom crosshair - Secondary different crosshair #661

[nullsystem]

@sunzenshen Updated for code review changes: f8c2bf1

[sunzenshen]

Optional nits: I'm not sure if the Valve utilities are that much better or even up to date but might as well point them out to decide if we want to keep using them.

[nullsystem]

@sunzenshen 2nd code review changes: 5536977

[nullsystem]

@sunzenshen More sanity checking in place: 2c554ea

[sunzenshen]

The crosshairs in game look good to me, though there is a bit of a UI quirk with 1080p resolution, where if I scroll down with mousewheel on one tab, if I go to a tab that is currently set to a default to others single line config, it looks initially like the page is empty, though that can be rectified by scrolling up with the mousewheel. Maybe the scroll of the page should be reset to the start when a tab is clicked?

crosshair-scroll-transitions-to-next-tab.mp4

[nullsystem]

@sunzenshen 3rd code review changes: 196821d

[sunzenshen]

Also tested the tab switching and the page start reset looks good.

[AdamTadeusz]

I would argue that, since the zr68l is a dmr with the same scope with backup iron sights that the mx has, that it should also get a hip fire crosshair. Also no grenade crosshair? 🥺