Apply game.project values using the Mustache templates to gradle and pod file

[AGulev]

Is your feature request related to a problem? Please describe (REQUIRED):
To be able to configure a complicated extensions such as an ADS mediation that would be useful to insert values from game.project file into gradle and pod file (when this task will be implemented)

Describe the solution you'd like (REQUIRED):
Apply Mustache templates to gradle and pos file the same way as we do it for AndroidManifest.xml and plist

Describe alternatives you've considered (REQUIRED):
Create many repos for each ADS network in mediation and add each of them into the project separately.
It's hard to maintain.