Redefine local flags commands and minor fixes in disasm.c

Use Color_RESET after fcn, label and flags in disasm.c
RCore.anal_fcn_local_list() now takes RCore* as 'self'
Redesign commands to add/list/remove local flags (f.)
f.a@3: set local flag 'a' at offset 3
f.   : list locals in current function
f.*  : as above using radare commands output
f.** : list all locals from all functions