Optimized bandwidth usage

• changed the default display resize mode from scale to none (config.js); this eliminates a loss of display sharpness when the aspect ratio is not preserved; reconnect is not supported by Windows Server 2019 (see documentation)
• if using scale on resize, the aspect ratio is now preserved by default (config.js)
• lowered bandwidth usage: the default display quality is now JPEG 75% (lossy) instead of PNG (lossless) (config.js); this significantly reduces the size of display updates when using graphics applications and JPEG is generated faster
• lowered bandwidth usage: the adaptive fullscreen update is now disabled (config.js); it's not needed most of the time (unless if the display quality is poor); it's role is to restore the display sharpness and fix potential display issues when the user becomes inactive
• lowered bandwidth usage: the default audio compression is now MP3 128 kbps instead of WAV 1411 kbps (config.js)