Refactor server/client + shrink monster headers

[a-teammate]

what we do with this PR:

• refactor the whole sourcebase to be more modular. (a lot of headers become directly includeable)
• make all of our gigantic common headers a bit smaller
  • tools.hpp even gets completely shrinked
• remove the listenserver
  • this was a functionality for offline modes to run without a server exposed to others.
  • including a lot of extra rules and complexity for them
  • this step was necessary to clean up the design of the client/server model
• remove remaining functionality regarding singleplayer campaigns
  • see point above: were pure multiplayer.
  • if campaigns come back, they will come back as multiplayer campaigns
• refactor the weird gamemode code
  • its still not perfectly in shape, but #339 should be fullfilled
  • (and any system beyond that should probably be more generically designed)

320 (refactor the gameserver code) is in reach (could be done in this PR, but no need imo)

and even #170 is pretty near.

Is it working?

Its working for e.g. ffa or teamplay, but some other modes are not fully working yet.
The following bugs are to solve:

• [x] fix the capture/ctf/bomberman network issues
• [x] fix the mastermode issue
  • if you disconnect with mastermode locked and reconnect you can not claim master
• [x] add PRIV_LOCAL for connections via localhost
• [x] reintroduce localconnect
• [x] Flex: always start a server with inexor
• [x] fix the logger (for multiple instances)
• [x] fix gamespeed issues
• [x] fix the malformatted timestamps
• [x] test the screenshot functionality
• test the demo mode (on the hackathon)
• fix the userinfo about the players being wrongly placed (deferred, probably caused somewhen else)
• [x] fix missing logging of the server

afterwards we could

• [x] enable the server RPC #431
• [x] rename the inexor binaries #430

severity?

This does touch a lot of code. probably best to merge it as soon as the issues are resolved.

How to test?

build and install as usual (see wiki). afterwards npm start in the flex directory (to start the client) afterwards/or before that click the server.bat (or the server script for unix) ingame write /connect into the console. thats it.

[aschaeffer]

I'll review it soon.

[a-teammate]

If you find more bugs than the listed ones: would be great to hear :)

[a-teammate]

@Croydon i reverted that change. I will squash these two commits ("do x" and "revert do x") as soon the ci ran through one time. @aschaeffer plz review EDIT: I squashed em

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[a-teammate]

I think i found the source of the remaining gamemode issues @aschaeffer (return instead of break.. err)

Also i reverted any change regarding the maxfps (so the gamespeed should be normal again when using maxfps)

-> Mergeable!

[aschaeffer]

I'll try it today or tomorrow