Fbe/redo file architecture clean

[fbeutin-ledger]

Description

Redo utils / src_common structure to prepare for better plugin sdk generation

Changes include

• Bugfix (non-breaking change that solves an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (change that is not backwards-compatible and/or changes current functionality)
• Tests
• Documentation
• Other (for changes that might not fit in any category)

Diff on plugin sdk:

Only in ethereum-plugin-sdk: LICENSE
diff -r ethereum-plugin-sdk/include/eth_internals.h ethereum-plugin-sdk-old/include/eth_internals.h
25a26,27
> #define RUN_APPLICATION 1
> 
diff -r ethereum-plugin-sdk/include/main.c ethereum-plugin-sdk-old/include/main.c
20d19
< #include "lib_standard_app/swap_lib_calls.h" // RUN_APPLICATION