Fix sugar_add_ios_gtest description [skip ci]
Add sugar_add_executable
Update examples: use sugar_add_executable/sugar_add_ios_executable
Simplify iOS detection: check CMAKE_OSX_SYSROOT is equal to iphoneos
Update gitignore [skip ci]
Run gtest builds
sugar_install_library support multiple targets
Add adaptation script: adapt_sugar_functions.py [skip ci]