feat: add appguru tool

This commit add the 'addguru' tool. Such tool is used to compile C language payload for XPS generated CPUs. An example of the usage of the framework can be seen in the following projects.

Synthesize first the projects and compile the appguru projects then.

test_ppc_fmc25 https://gitlab.msktools.desy.de/fpgafw/projects/playground/test_ppc_fmc25/-/tree/master

make project cfg=default_PPC
make build cfg=default_PPC
make project cfg=default_PPC_appguru
make build cfg=default_PPC_appguru

tmcb_bare (on branch test_xps_integration) https://gitlab.msktools.desy.de/fpgafw/projects/example/tmcb2_bare/-/tree/test_xps_integration

make project
make build
make project cfg=default_bootloader
make build cfg=default_bootloader