CMake everywhere! (#17)

* Removed premake files
* Added CMake configuration to example projects
* Cleaned up CMake files
* Moved CMake backend selection option from examples to orhi
* Updated README
* And a few other things

Initial implementation of a generic pipeline object (graphics + compu…

…te) (#8)

* Made `GraphicsPipeline` into a generic `Pipeline` class, which can be either a compute or graphics pipeline
* "Graphics queue family" renamed to "graphics and compute queue family"
* Added support for compute operations

Updated README to fix notes formatting

Added support for tessellation shaders

Added links to template projects to README