Another issue that seems related to #1122

Regression introduced by !2279.

Resolves #1122

Ported skincolor cache management from the secondcolor branch
Adjusted R_GetTranslationRemap to use a similar caching scheme
Made sure that if a skincolor was updated, then related translations would be rebuilt

Delete 'translations' Lua global

Moved string conversion helpers into m_misc.c
Adapted parser to check for '"'
Check if tokenizer returned NULL

Capture '"' characters
Capture ';' tokens
Implement tracking of the current line

Co-authored-by: Zwip-Zwap Zapony <zwipzwapzapony@gmail.com>

This reverts commit fc1e8fb52f88e56c6a32b3e7e643bc1356b507c8.

add mutex locks to UPnP Client code

set upnpc_started to 1 a the end
wrap upnpc_started into a struct

Moved UPnP startup code to a thread