Various cmake improvements

Use scripts/version.sh, and set version in project() using its output.
Instead of using a variable to store the definition of
TINYALSA_USES_PLUGINS, and adding it as a compile option, use a
generator expression to define it in target_compile_definitions when the
option is enabled.
Set BUILD_SHARED_LIBS to on by default.
Add options to disable examples and utils.
Instead of using SRCS and HDRS variables, set PUBLIC_HEADER property on
tinyalsa to install the headers along with the target.
Set library version, so the shared library will have version suffixes.
Check that C warning flags are supported instead of adding them
unconditionally.
Use ${CMAKE_DL_LIBS} instead of hardcoding "dl", and add it to
tinyalsa's link interface and link depends, instead of linking it in the
examples and utils.
Add the "include" directory as a PUBLIC include directory to tinyalsa,
instead of making it PRIVATE and adding it to examples and utils as
well, because anything linking the tinyalsa target will need to include
"include".
Instead of using macros for building examples and utils, use a for loop.
Include cmake's GNUInstallDirs to automatically correctly populate
installation dir variables, instead of doing it manually.

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