move optional command prefixing out of con_tty and con_curses to a later shared point

Main intended change is to carry the information of the commandprefix's existance on to a later location in the code
and to not add an enforced prefix anymore to history if it wasn't used

Unintentionally the whole thing should now also enable the win32 console to do the same.
adding com_consoleCommand which sets the default command that gets used for text entered into the consoles
this works for ingame as well as outgoing consoles

an empty value will make all entered texts executed as commands direclty
by default it's set to "say" for the client and is empty for the dedicated server
Use memcmp instead of self-built while loop
add a few lines of documentation to com_consoleCommands code
fix wrong socket ID comparison
Print “execing …” only if successful.
/execq – execute a script without notification.
Don't include client.h in sdl_glimp.c as it is part of the external renderer lib.
Fix restoring fs_game when default.cfg is missing.
Change more operator commands to require sv_running to be usable. Patch by Ensiform.
Fix a few comparison off-by-ones.
Change error message in CL_ConfigstringModified to specify out of range index like in server.
Show effects of colour controls in the messagemode input fields.
Fix writting voip data in demos.
Fix server ignoring client move commands if voip data is included.
Allow changing cl_voip without restarting. Fix assert failing in CL_ParseVoip() while flipping cl_voip off and on.
Fix clients being able to reset their player state and respawn using donedl.
Colorize text on win32 console

Text input line color based on code by "spior"
Main colorize function based on Sys_AnsiColorPrint in sys_main.c
win32 colour console: don't show colour controls. UNTESTED.
Fix win32 dedicated input line printing to backlog

Use to write win32 input line using WriteConsole then overwrite by
CON_Print, so when CON_Print removes color format characters the end of original input line was visable.

"hi ^1guys" use to be shown as "hi guysys" in the console backlog.