NewCmd creates execute command which triggers defined build and/or run script When --watch is defined it will continuously observe file system changes in the defined set of directories and re-runs build and run command when they occur.

BuildFlagName is a name of the flag defining build process.

NoBuildFlagName is a nme of the flag which disables build execution.

RunFlagName is a name of the flag which defines process to be executed.

DefaultExclusions is a slices with glob patterns excluded by default.