Allow using labels as argument to `rst`

This was made separate with the intention of supporting multiple versions,
but after some discus...

This allows using a label as the argument to a `rst` instruction
Fixes rednex#448

We're about to break the format, so let's do this

"fixed" and "aligned" location checking advanced the target location to places
regardless of the...

They weren't used save for the definitions right below, so Occam's razor applies

Why was this an enum in the first place, anyways?

Improve dependency generation

Remove undefined behavior from shifts

This script allows diffing two Game Boy ROMs using `xxd` and `diff` and
attempts to augment the ...

Can't hurt to specify those as they are now. Perhaps it'll enable slightly more
compiler optimiz...

Windows does not honor `%F` nor `%T` in `strftime`. These are worked around
by writing the full ...

It should behave identically to both of these on separate lines

Report failing file names in comparisons

`asl` and `asr` in `src/link/patch.c` courtesy of @pinobatch, and rearranged in RGBASM
evaluators.

The files being diffed (especially for variants) are temp files, so their
names are pretty nonde...

Fixes rednex/#446.
I am not sure this is the best (in cases where the target directory
is not wri...

This option allows for automatic dependency detection and generation:
as soon as a missing file i...

Adds a phony target to every included file, mimicking gcc's

This is done to match GCC's behavior.
Also, this unifies the code of -MT and -MQ.

Just like GCC's -MQ, this is basically -MT but the file name is escaped.

Allows overriding the output file in dependencies, which also allows
outputting those without als...

Allow ROMX and WRAMX sections in restricted modes

Overhaul the symbol system

This is actually not necessary, because RGBLINK would warn about missing labels.
Besides, through...

Stop using that bitfield for everything, including what can be determined otherwise
It also makes...

This reduces complexity, basically

This prevents a conflict in the next commit

They'll most likely fail as well, just adding redundant error output

Add license headers where missing

This became unnecessary when the linker script parser was rewritten ad-hoc

`char` has implementation-defined signedness, and if it's chosen to be unsigned,
then -1 gets con...

Closes #462, although with this implementation `BANK("some ROMX section")` would
return 0 instead...

Enforce trailing slash in include paths

They were in the wrong order for some reason, this especially caused user
warnings to be off by d...

This could otherwise cause segfaults while reporting errors (!) during placement

Those files don't exist in RGBLINK's source anymore

Fixes rednex#456

How the f did it work before

This allows `BANK("Some ROM0 section")` to be used in a constant expression

Run tests on MinGW versions

This removes many false positives with Windows

POSIX leaves undefined the order of output if stderr is injected into stdout,
and in practice it ...

This has a serious tendency to just blow up process load (~35 here with the shim)

Always update version

Fix declaration of constexpr_BankSymbol()

Implements https://github.com/rednex/rgbds/pull/378#issuecomment-569836686

Make `BANK(@)` and `BANK("section")` known to RGBASM

Fix mingw build

Overhaul RGBDS man pages and help messages

Overflow with `int16_t` is defined to two's complement so it's OK
This could trigger when jumping...

The previous name was probably copy-pasted, it was completely wrong

Trimmed down the option lists as per @bentley's request;
Reinstated the man pages' synopsis

Fixes #461