drop accidental autorun for tray

float aspect-scalemode drag-rz

0.5-pre1 tag

add browser opts, silent exit opt

(vrviewer) fix mapping source evaluation

0.4.0.3 tagged

changes:
 * vr viewer tool work begun
 * cropping / slicing reworked

weekly tag bump, only minor fixes this time

synch version scheme updates with arcan

added preliminary launcher script

Time for a new release. See the blogpost at

https://arcan-fe.com/2017/09/22/arcan-0-5-3-durden-0-3/
along with the CHANGELOG.md file for more details.