When we switched `ZSTD_SKIPPABLEHEADERSIZE` to a macro, the places where we do:

    MEM_readLE32(ptr) + ZSTD_SKIPPABLEHEADERSIZE

can now overflow `(unsigned)-8` to `0` and we infinite loop. We now check
the frame size and reject sizes that overflow a U32.

Note that this bug never made it into a release, and was only in the dev branch
for a few days.

Credit to OSS-Fuzz

[regression] add more methods

as requested in #1391

Advanced API

as suggested by @terrelln

Refactor examples to avoid code duplication.

Add buck build instructions to README.md

only applies in MT / async context now.

for naming consistency

so that it please both
compilers which warn for dead code after the switch
and
compilers which do not detect that all branches terminate.

and ZSTD_DCtx_setParameter()

advanced parameters compatible with ZSTD_decompressStream().

Update meson build and add Travis test for it

check availability of --color=never command on grep and egrep

before applying them.
Fixes #1436

[regression] Add dictionary support