separate scan dir from executable/build dir

[kyleboyle]

I've found this feature useful for the scenario where a project has multiple sibling packages, one of those siblings being the executable, the other beings libs/utils.
example:

/project - base dir
/project/web - web server
/project/common - common buisness object and utilities
/project/batch - daemon processes

cd /project
gin -t . -e web

this will scan /project/* for changes and reload application defined in /project/web/

gin -t . works as before

[anarcher]

👍

[slogsdon]

👍

[alvarowolfx]

👍

[ibash]

Sorry for the delay -- if you want to resolve conflicts I'd be happy to merge.