Don't prepare platform N times if N files have been changed.
Don't prepare platform N times if N files have been changed.

Move platform preparation out of beforeBatchLiveSyncAction and call it once
before processing changed files.

NativeScript/nativescript-cli,tsvetie/nativescript-cli,tsvetie/nativescript-cli,tsvetie/nativescript-cli,tsvetie/nativescript-cli,NathanaelA/nativescript-cli,NathanaelA/nativescript-cli,NathanaelA/nativescript-cli,NativeScript/nativescript-cli,NativeScript/nativescript-cli,NathanaelA/nativescript-cli,NativeScript/nativescript-cli,tsvetie/nativescript-cli