Changed server version detection to use numbers

Changed the server version detection to use numbers rather than strings.
This allows for numerical comparisons to determine if a particular
function is supported.

The general convention for version numbering would just be the official
JC2-MP server version without the dot separators (e.g. Server version
`0.1.2` becomes `12.0`). The server version is represented as a
floating-point number to account for the possibility of additional
releases within the same version branch (e.g `0.1.2a`) should that ever
happen.

Server version `-1.0` represents server version is not yet known. This
can happen if a modified server is loaded or if a new server is loaded
with a older GUI. All functions are assumed to be compatible if the
server version is unknown.

COM/server/com.lua

@@ -39,7 +39,7 @@ ProcessDO = true
 
 -- Setup --
 ActiveLinks = {}
-ServVer = "UNKNOWN"
+ServVer = -1.0
 
 io.stderr:setvbuf("no") -- Disable output buffering
 io.stdout:setvbuf("no") -- Disable output buffering

COM/server/comlink.lua

@@ -143,7 +143,7 @@ function SERVER_COM:StartHandshake()
             if string.starts(response, "VALIDATE ") then
                 local resp = string.split(response, " ")
                 local GUI_VER = resp[2]
-                ServVer = resp[3]
+                ServVer = tonumber(resp[3])
                 self.UseHash = toboolean(resp[4])
 
                 if (tonumber(GUI_VER) < MIN_GUI_VER) then