_BitScan{Reverse,Forward} add check for undefined

Adding --[no-]content-size to the cli

Removing no-tree-vectorize for intel

[opt] Don't recompute initial literals price

[ci] Adding icc make check to travis

Add issue templates to zstd

LZ4 just added this. I think it would be helpful here too.

[doc] Fixing ZSTD_c_compressionLevel confusing note

[zstdgrep] Log zstd decompression errors to stderr

Dont log errors when ZSTD_fseBitCost() returns an error

--show-default-cparams Adding hashLog

* Replacing with boilerplate from cirrus

* Adding task name and adding back freebsd 11.x

* Changing from 11.3 to freebsd-11-3-snap

* Rearanging the order of matrix and instance

man page : added `--verbose` long command

also updated `zstd.1`
stacking prior updates completed on `zstd.1.md`.

Fix pkg-config File Generation Again

Update CIFuzz file and turn off dry-run mode