CMake supports a number of strings for truthy and falsey values.
ON/OFF and TRUE/FALSE are the most popular but 1/0 is also supported.
This is mostly a style choice but I'm inclined to believe that ON/OFF
is the most popular option and I'm generally in favor of style
choices that better align with the community at large.
Mentioning the version number isn't always necessary so I removed
some instances of the version number to prevent us redoing this work
for new major releases going forward.
In a few places I left references to the old name where appropriate.
There are also many CMake references to "OSX" that we have to keep
using since CMake does not offer alternative names for those variables
and target properties.
What's new in the templates:
- Removed support for 32 bits and gcc
- Removed useless code
- Removed custom warnings settings – let Xcode decide with its default values
- Set default target version to CMAKE_OSX_DEPLOYMENT_TARGET
What's new in cmake script:
- Added cmake options for archs and deployment target
- Added minimum requirements checking
