Updated Travis config
Updated high/low ping messages
Fixed dmaHD entering an infinite loop on certain maps

In certain cases (sound/misc/windfly.wav in ut4_kingsgambit_a9.pk3, for example), dmaHD_NormalizeSamplePosition will get a "samples" value of 0, and it will enter an infinite loop. This is happening because the "data" chunk of a wav file has a size of 0. According to ioquake/ioq3@ae39051f, these are legal, so I didn't change the behaviour of the wav file loader.
Removed chat background
Saved password on the client
Removed unwanted (and not working) rcon command behaviour on the client
Updated the rcon command to not send the specified password if it has the same as the values of
Updated rcon status command for proper formatting with long names
Left-aligned all fields for the `status` command
Also cleaned up some code. C is magical.