Fixes and improve SKIP_* directives

[douniwan5788]

Make the FPGA bitstreams working with SKIP_* define.

Now, you can enable at least two of your favorite technologies (such as LF and HF 14443A) attached a standalone mode and still have spare ROM space for other functionalities on a Proxmark3 Easy with a 256KiB ROM.

[github-actions]

You are welcome to add an entry to the CHANGELOG.md as well

[iceman1001]

Nice, let me know if you think its ready for merging

[douniwan5788]

Looks good to me. Ready to merge!

[iceman1001]

Awesome!

[doegox]

@douniwan5788 I'm afraid it broke sth at least on RDV4
From commit 413a17a there is something very strange going on with the FPGA...
my RDV4 becomes unresponsive after a hf 14a info, and lf search powers the HF antenna...
EDIT hmm it's fixed with a make clean. There is some missing dependency to force cleaning if order of images changes

[douniwan5788]

@douniwan5788 I'm afraid it broke sth at least on RDV4 From commit 413a17a there is something very strange going on with the FPGA... my RDV4 becomes unresponsive after a hf 14a info, and lf search powers the HF antenna... EDIT hmm it's fixed with a make clean. There is some missing dependency to force cleaning if order of images changes

Yes, I also find the build system of pm3 to be quite fragile. It sometimes fails to detect certain source code changes, leading to the need for manual cleanup operations.