(cherry picked from commit f584b61c)

Fix NOCURL compiling

See merge request KartKrew/Kart-Public!197

Let servers send httpsource without curl

See merge request KartKrew/Kart-Public!196

[OSX] Fix "SIGILL: illegal instruction" on macOS Catalina

See merge request KartKrew/Kart-Public!194

on OSX, strncpy may copy to overlapping (protected) memory. this
sometimes happens when loading WAD files.

This patch eliminates these problems for me

(cherry picked from commit be14b8a564a89a5afb84ac19f1586f3db7f68367)

Make the HTTP Master Server official

See merge request KartKrew/Kart-Public!193

Bump MAXNETNODES to 127

See merge request KartKrew/Kart-Public!192

Clarify addon-related messages

See merge request KartKrew/Kart-Public!190

Fix memory leak in W_ReadLumpHeaderPwad

See merge request KartKrew/Kart-Public!182

Fix user agent for HTTP downloads being set as SRB2Kart/v1.1.2

See merge request KartKrew/Kart-Public!185

Ogl colormap fix third attempt

See merge request KartKrew/Kart-Public!184

clientside ack fix

See merge request KartKrew/Kart-Public!186

Stops the client from using reliable packets before joining a server
Clients can time out during addon loading
sending reliable packets before then can cause out of order acks
This causes joinbug, chatbug, and chatspam, as well as
general server instability due to unnecesary packetspam

Fix bug in the OpenGL colormap bugfix

See merge request KartKrew/Kart-Public!183

Fix bug in OpenGL encore colormaps

See merge request KartKrew/Kart-Public!180

Fix opengl crashing on startup due to lack of checks

See merge request KartKrew/Kart-Public!179

Also fixes the log file not being written to the home directory.

Fix clang compiling

See merge request KartKrew/Kart-Public!176

Some uninitialised variables that GCC 4.4 complains about

See merge request KartKrew/Kart-Public!177

Fix visplane getting allocated twice

See merge request KartKrew/Kart-Public!172

This should be okay since 0 generally means "nothing" for these, and they should always be set before being used later on.

Fix Travis Deployment

See merge request KartKrew/Kart-Public!174

Also apply HUD translucency to FREE PLAY

See merge request KartKrew/Kart-Public!161

Fix wrong orientation in some boost pads in ogl

See merge request KartKrew/Kart-Public!173