ivt: Move IVT modules to new top-level module namespace "ivt", deprecate old names in "deps/ivt"

Closes #208 (closed)

Changelog entry: Move IVT modules out of 'deps' folder

Changes:

• copied ivt modules from deps/ivt to top-level ivt (reflects gitlab structure https://git.h2t.iar.kit.edu/sw/ivt)
• fixed all existing modules to now depend on ivt instead of deps/ivt
• added deprecation notice to deps/ivt modules. Modules will be removed by the end of the year

Changes required by the users:

• after upgrading axii and the workspace, both deps/ivt and ivt/ repos will be availabe. This will likely cause some linker issues as (CMake) configured projects will still point to deps/ivt. Therfore, executing axii workspace auto-remove should be considered mandatory.