Add .polly

[ruslo]

Use ~/.polly and local .polly (do we need local?) to add some default user's arguments like --jobs N or --fwd HUNTER_CONFIGURATION_TYPES=Release. .polly can be ini-like file. E.g. say we have several devices:

• iPad with iOS 9.0
• iPhone with iOS 9.1
• HTC One with Android API 21
• Prestigio with Android API 19

~/.polly can contain:

[global] # reserved type
  jobs = N
  fwd = HUNTER_CONFIGURATION_TYPES=Release # is it correct syntax?
  verbose = True
[ipad]
  toolchain = ios-9-0-armv7
[iphone]
  toolchain = ios-9-1-armv7
[htc]
  toolchain = android-ndk-r10e-api-21-arm64-v8a
[prest]
  toolchain = android-ndk-r10e-api-19-armeabi-v7a-neon

Usage: build.py --type htc or build.py --class htc

[ruslo]

Probably extending CMake is a better idea:

• https://github.com/ruslo/CMake/issues/3