Added serial communication files.
fix fernando files
Merge branch 'fbcbarbosa-RS-232' into RS-232

Conflicts:
	.gitignore
	libraries/fixed_float_types_c.vhdl
	libraries/fixed_pkg_c.vhdl
CORE: Fix git ignore after merge
CORE: Remove modelsim from tracking
add licence GNU GPL v3.0
Fix, again, gitignore
New RS-232 branch
Merge branch 'NEW_RS-232' into RS-232
Merge branch 'RS-232'
CORE: Update some broken files after merge, now it compiles fine: TODO: instantiate RS232 on top