KrimZon's FTE_STRINGS port, please test!

KrimZon's FTE_STRINGS port, please test!

// float(string haystack, string needle) strstr = #222;
float(string haystack, string needle, float startpos) strstrofs = #222;
// str2chr was already there
// chr2str was already there
string(float ccase, float calpha, float cnum, string s, ...) strconv = #224;
string(float chars, string s, ...) strpad = #225;
string(string info, string key, string value, ...) infoadd = #226;
string(string info, string key) infoget = #227;
float(string s1, string s2) strcmp = #228;
float(string s1, string s2, float len) strncmp = #228;
float(string s1, string s2) strcasecmp = #229;
float(string s1, string s2, float len) strncasecmp = #230;

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@7497 d7cf8633-e32d-0410-b094-e92efae38249