build: split source and header directories

Split the headers and source to simplify the install_header
directive such that we no longer need to specify cpp files
to exclude in the install_header cal

build: split source and header directories

Split the headers and source to simplify the install_header
directive such that we no longer need to specify cpp files
to exclude in the install_header call.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Iac4c38f95e690aa8ef8ecf87b032f55a1a31409c

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