BREAKING CHANGE: the `gop` alias has been renamed to `gopa` to avoid conflict with
Go+ `gop` command.

Fixes #10504

Closes #10361

Closes #10220
Co-authored-by: Chaithanya Naik <chaithanyampcrl@gmail.com>

Closes #7786

https://english.stackexchange.com/a/180617
https://web.archive.org/web/20190728053012id_/grammarist.com/usage/up-to-date/#text-60

Also, add `gom` alias to `go mod`.

Signed-off-by: Ricardo Seriani <ricardo.seriani@gmail.com>

add alias to cd to $GOPATH, $GOPATH/src, $GOPATH/bin

Per the [`go` command specification](https://golang.org/cmd/go/#hdr-Package_lists),
the `...` wildcard matches the empty string. This makes commands like
`go <action> . ./...` unnecessary: they should use `go <action> ./...`.

This also fixes a bug with the `gofa` shortcut, where it would emit an
error if called from a directory containing no go source files (but
having subdirectories that _did_ contain go files).

*  Also gfa conflicts with git shortcut

inspired from #2018