updatepowerups functie naar servergame verplaatst
client add en mainscreen add naar servergame
Added function to handle username with textfield
Help method so beneficial powerups occur more frequently.
Added chances to settings.
sockethandler handlet alleen nog maar de sockets!
Now chances relative to each other instead of fixed '100%'.
Revert settings + increased chance for beneficial powerups.
cleaning sockethandler
function naming a client is not a player. Player is an object in the game.
Merge branch 'development' of https://github.com/olafmaas/contextprojectgroep6.git into PowerupFrequencies

Conflicts:
	src/server/ServerGame.js
More players now result in faster powerup spawns, linearly.
Username is now checked and message given if it is already in use
Removed old socket.emit from handleplayerconnection
It is possible to pick an already existing name, as long as that player isn't currently active
Server remembers score in case a player reconnects with the same name
Slightly updated randomPowerupType
Merge branch 'username_screen' into development

Conflicts:
	src/server/ServerGame.js
	src/server/SocketHandler.js
Labels are two times as big now
Merge branch 'bigger_labels' into development
Username length checks

Length can be specified in settings.
When a username is null or empty, it will show a message that a
username cannot be empty.
When a username is too long, it will show a message that the username
is too long.