webpmux: let -- stop parameter parsing

this enables webpmux to accept input files starting with '-' when using
-get/-set/-strip; -info & -frame expect an input file as one of their
parameters so no changes are necessary there.

Change-Id: I154eb6dc388258a7fb743ec76ba869bf9589be1b
manpage pedantry

from man-pages (7):
provides a comma-separated list of related man pages, ordered by section
number and then alphabetically by name, possibly followed by other
related pages or documents. Do not terminate this with a period.

Change-Id: I6763b3b3a89f3c2e9ed5c1a4e9d05fb9ce85dd40
README: add a section on gif2webp

Change-Id: Ie701da16223df7482f7b017150242ba2d381d0b5
Merge "manpage pedantry"
Merge "README: add a section on gif2webp"
Merge "webpmux: let -- stop parameter parsing"
NEON speed up

add TransformDC special case, and make the switch function inlined.
Recovers a few of the CPU lost during the addition of TransformAC3
(only on ARM)

Change-Id: I21c1f0c6a9cb9d1dfc1e307b4f473a2791273bd6
Merge "NEON speed up"
dec/webp.c: don't wait for data before reporting w/h

this partially reverts
f626fe2 Detect canvas and image size mismatch in decoder.

the original change would cause calls to e.g., WebPGetInfo to fail until
a portion of the image chunk was available. With lossy+alpha this meant
waiting for the entire ALPH chunk to be received.
this change restores the original behavior -- reporting the values from
VP8X if available -- while retaining some of the added canvas/image size
checks if the image data is available

Change-Id: I6295b00a2e2d0d4d8847371756af347e4a80bc0e
dec/frame.c: fix formatting

since 26d842e NEON speed up

+ drop a duplicate and from a comment

Change-Id: I710f46f83b80161064910c7efc16788b88c089fe
Merge "dec/webp.c: don't wait for data before reporting w/h"