v0.19.0

Changes

• Merge 0.18.6 @ekoby (#207)
  • force session refresh if router closes edge connection
  • ziti_log_level()
  • fix handling of controller errors
  • remove controller keep-alive and set timeout to 15s
  • fix crash if conn is closed before connect reply

Features

• implement ziti_context level events @ekoby (#203)
• Ziti conn improvement @ekoby (#206)