Gamepad fixes & changes

Closes #813

See merge request STJr/SRB2!1899

Fix fox follower's flickering flindicator (fixes #819)

Closes #819

See merge request STJr/SRB2!1918

Fix use after free bug

See merge request STJr/SRB2!1867

Fix HurtMsg inflictor mobj type discriminator

Closes #874

See merge request !1903

Fix scaling mistake in A_FishJump

Closes #939

See merge request STJr/SRB2!1915

Allow setting NiGHTS hoop pitch & yaw in degrees (in binary map format)

See merge request STJr/SRB2!1892

Various controller fixes

Closes #936 and #937

See merge request !1914

This prevents axis events from trickling out of the menu and taking
effect in G_Responder when they aren't hitting the digital deadzone
needed to be mapped into internal menu key events.

Was erroneously mapping events inside the deadzone as key down and vice
versa.

MSVC project file works again! Supports Visual Studio 2022.

See merge request STJr/SRB2!1904

http-mserv: add SRB2-specific user agent string

See merge request STJr/SRB2!1893

Also fixed issues with the d_netcmd.c file/folder adding logic.

Fixes regression of mobj type discriminator not working
for this hook.

blame 8d382e49

Remove PF_SPINNING upon use of any jump ability, so that directionchar works properly

See merge request STJr/SRB2!1429

Dynamically allocate space for a state's action field

See merge request !1478

Extend the length of the Connect via IP textbox.

See merge request STJr/SRB2!1410

Don't force bit depth to 8-bit when setting default video mode

See merge request STJr/SRB2!1733

Metal Sonic boss fight fixes

Closes #93 and #931

See merge request !1896

Fix a few rendering errors

See merge request STJr/SRB2!1901

Credits go to Lactozilla

This renders the "quadrant hack" and ZenNode largely useless

Fixes random invisible walls and possibly more errors

Increased maxsend

See merge request STJr/SRB2!1895