Summary:
I wanted to rename xbus because its relation to //swift// is not immediately clear from the name.
xswiftbus seems reasonable.
Reviewers: #swift_pilot_client, kbasan
Reviewed By: kbasan
Subscribers: kbasan, jenkins
Tags: #swift_pilot_client
Differential Revision: https://dev.swift-project.org/D14
Added externals.pri looking for the external headers/libraries in 3 steps:
1. Manually set absolut path. Currently commented. Uncomment for local
use.
2. Enviromental variable "VATSIM_EXTERNAL_DIR"
3. default path client/externals.