make p1xbratenversion available in server

- bump EOS SDK version to v1.16.4

- SVN r6856 (ENet 1.3.18)

- misc anticheat server fixes (#71, #72, #73)

- bump EOS SDK version to v1.16.1
- misc upstream ENet fixes
- SVN r6856:
  - specchat server variable, set to 1 to broadcast teamchat between specs (only)
  - better ammobarhideempty behavior
  - isspectator returns player1's state when used without argument
  - new edit commands selchildcount & selchildmat

- fixes #specmute: it did nothing...

- fixes file integrity checking on macOS
- restores support for 's' flag in inputcommand
- keeps fullscreenmonitor var out of init.cfg (for vanilla compat)

- fixes some checkboxes in the options menu

- adds the `#specmute` remote variable: when 1, spectators can't send any chat messages
- adds the `#tourney [MM:[SS]]` remote command, which is the same as `#competitive`, but also enables specmute for the next match

- fixes the fullbright options in the options GUI

- when usep1xbratenmenus is 0, the vanilla serverbrowser and scoreboard are now used
- adds the fullscreenmonitor variable: specifies on which display the game runs on when in fullscreen mode, 0 being the primary display
- adds the getnummonitors command: returns the number of connected displays
- adds the getmonitorname <id> command: returns the name of the monitor with the specified index
- misc updates from SVN

- updates Epic SDK to version 1.15.4

- adds a search field to serverbrowser using the new `filterservers` variable
- adds the `setfont <name>` command
- adds the `getip <cn>`, `ban <ip> <minutes>`, `unban <ip>`, and `listbans` remote commands (admin-only)
- adds `replacetex` and `replacetexsel` from SVN in favor of the earlier `replacetex` p1xbraten command
- adds the `serverbotbalanceearly` server variable (useful for pub ictf etc.)
- fixes lots of small things

- update Epic SDK to version 1.15.1

- fix enet linking when cross-compiling for macOS

- adds a message with server information at the beginning of a demo

- server now reports mod ID 9 via extinfo (previously assigned to waiter)
- adds anticheat support:
  - adds `-e` command-line flag to enable anti-cheat functionality
  - adds launch scripts that use this flag
  - adds `forceanticheatclient` server variable
  - adds read-only `anticheatenabled` variable
- allow setting match time in `competitive` remote command: `#competitive 5:00`
- fix timestamp roll-over in server logs
- fix bugs in clien-side demo recording:
  - remove buggy `recordclientdemo 1` to schedule recording for next match (use `recordclientdemonext = [mapstart = [recordclientdemo 2; mapstart = []]]` instead)
  - omit certain packets (e.g. auth or anticheat related) from demo
  - allow recording coop edit sessions (EXPERIMENTAL)
  - fix recording when match is paused at the beginning

- fixed a bug that starting a local game from the start screen someti…

…mes crashed the game