FIX Antenna C/C++/.NET

To configure FIXAntenna properties with an environment variables you need the following:

1. Define environment variable in the system:

   Linux	export PATH_TO_LICENSE=/etc/all_licenses/engine.license
   Windows	set PATH_TO_LICENSE=C:/all_licenses/engine.license

2. Apply environment variable. FIXAntenna can utilize environment variables in the engine.properties file, using the syntax:

   ${EnvVarName} - this construction will be substituted with an actual value of EnvVarName

   Example: 

   # The license file path.

   LicenseFile= ${PATH_TO_LICENSE}