Incompatible modules in standalone DANKARMULTI

[francesco-scar]

Describe the bug Some standalone modules are incompatible due to multiple definitions of the same functions, so we get compilation errors.

To Reproduce Steps to reproduce the behavior:

1. Set STANDALONE=DANKARMULTI in Makefile.platform
2. Edit armsrc/Standalone/dankarmulti.c similarly to the following:

   
   #include "dankarmulti.h"
   #define MODE_NAME em4100emul
   #define MODE_FILE "lf_em4100emul.c"
   #include "dankarmulti.h"
   #define MODE_NAME em4100
   #define MODE_FILE "lf_em4100rswb.c"
   #include "dankarmulti.h"

START_MODE_LIST ADD_MODE(em4100emul) ADD_MODE(em4100) END_MODE_LIST

3. Try to compile with make

**Expected behavior**
Compile successfully and get the two modules are available in standalone mode

**The problem**
I didn't searched exhaustively for the same problem with other modules, but with `lf_em4100emul` and `lf_em4100rswb` there are the same definitions of

static uint64_t rev_quads(uint64_t bits); static void fill_buff(uint8_t bit); static void construct_EM410x_emul(uint64_t id);

so just deleting them in the second file works fine.

Since dankarmulti actually includes the C source files in its own file, the static keyword doesn't help. Possible solutions are moving those common functions into a single, separate file (for example, `util`) or renaming each function differently in every module (maybe setting the standard to append the module name to each function or something similar). I don't know which one is the clearest solution.

[ghiki]

Personally I have the same problem with "icehid" and "tharexde", I solved easily renaming functions and references

in my case, in icehid.c, renamed all calls and fucntions itself from: append -> appendICEHID DownloadLogInstructions ->DownloadLogInstructionsICEHID

Same if you want tharexde + msdsal

[iceman1001]

To be more consistent with naming convention, try adding it as suffix instead. icehid_xxxxx vs tharx__xxxx

And some functions if doing the same should be moved to a common file instead.