gdb: more address styling throughout

I looked for the pattern 'gdb_puts (paddress (', these are places in
GDB where we are printing a target address without styling.  I changed
most of what I found to print the address as styled.

I did leave a few unchanged in psymtab.c, these are all in maintenance
commands 'maint print psymbols', 'maint info psymtabs', and 'maint
check psymtabs'.  None of these commands appear to print anything for
me (do we even use partial symtabs these days?  I thought not) so I
didn't want to mess with commands that I couldn't test.

Other than the additional styling, there should be no user visible
changes after this commit.

Approved-By: Tom Tromey <tom@tromey.com>