Version 0.5.0

• Make testTrackerInit version use TRACKER_VERSION (#110)
• Install composer programmatically (#108)
• Add PHP 7.4 and 8.1 to CI build (#107)
• Fix build on ARM (#102)
• Add a setter for session ID on a subject (#105) (Thanks to Tijmen Wierenga (@TijmenWierenga))
• Allow log dir to be overridden for FileEmitter (#106) (Thanks to Eric Tendian (@EricTendian))
• Update all copyright notices (#113)