Miscellaneous output changes

[Rangi42]

As we discussed:

• Allow printing symbols' ID numbers, since they show up in RPN expressions
• Users can just pass "type", not "r#type"
• Support special "none" keyword to disable all output for a feature
• Print counts one per line
• Only print blank lines between multi-line items (symbols, sections, assertions)
• Print a blank line between section data and patches when both are printed
• Only print a colon after "patches" or "bytes" when specific data follows
• Wrap RPN data, 16 bytes per line

And also:

• Don't panic when printing to a closed pipe, e.g. with rgbobj | head (see burntsushi's explanation)

This does not change assertions to print symbol names instead of "Sym#1337"; that's handled by the rgbds-obj package.

[Rangi42]

Using a local rgbds-obj repo to support v9r9 objects:

$ cat file.asm
SECTION "Section1", ROM0
        Label1:
        db 1, 2, 3
        dw Label1
        Label2:
        db 4, 5, 6
        dw Label2
SECTION "Section 2", ROM0
        dw Label1 + Label2
        assert warn, Label1 + Label2 < $ffff

$ ./target/debug/rgbobj -s name,type -p none -a src,offset file.o
file.o [304 bytes]: RGBDS object v9 revision 9

Symbols
-------

Label1
Label2

Sections
--------

SECTION "Section 2", ROM0
SECTION "Section1", ROM0

Assertions
----------

file.asm(10) @ $0002

$ ./target/debug/rgbobj -A -r infix file.o
file.o [304 bytes]: RGBDS object v9 revision 9
    Symbols: 2
    Sections: 2
    Assertions: 1

Symbols
-------

Label1 (#0) [local]
    file.asm(2)
    SECTION: "Section1" [@ $0000]

Label2 (#1) [local]
    file.asm(5)
    SECTION: "Section1" [@ $0005]

Sections
--------

SECTION "Section 2", ROM0
    $0002 (2) bytes:
    0000: 0000

    1 patch:
    file.asm(9) @ $0000 (word)
        PC in "Section 2" @ $0000
        infix expression:
            Sym#0 + Sym#1
        RPN data (11 bytes):
            [81 00 00 00 00 81 01 00 00 00 00]

SECTION "Section1", ROM0
    $000a (10) bytes:
    0000: 0102 0300 0004 0506 0000

    2 patches:
    file.asm(7) @ $0008 (word)
        PC in "Section1" @ $0008
        infix expression:
            Sym#1
        RPN data (5 bytes):
            [81 01 00 00 00]
    file.asm(4) @ $0003 (word)
        PC in "Section1" @ $0003
        infix expression:
            Sym#0
        RPN data (5 bytes):
            [81 00 00 00 00]

Assertions
----------

file.asm(10) @ $0002 (warning)
    PC in "Section 2" @ $0002
    infix expression:
        Sym#0 + Sym#1 < $ffff
    No message