meson: add necessary subprojects

Add subprojects for all the direct dependencies of the project such
that the project can be built outside of a Yocto SDK on a typical
Linux development system.

-

meson: add necessary subprojects

Add subprojects for all the direct dependencies of the project such
that the project can be built outside of a Yocto SDK on a typical
Linux development system.

- Update the .gitignore to ignore the subproject source directories.
- Update the .gitignore to ignore alternative build subdirectory
names as is typical with most projects in the openbmc organization.
- Add wrap files for direct dependencies, copied from other
repositories that already have the same dependencies.
- Modify the meson.build dependency for libgpiod so that the C++
bindings are included.
- Add many missing dependencies throughout.
- Sort all dependencies alphabetically for consistency.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I0feb6f0f175e6dba0b00a2c2b666eb0801575734

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