Performance improvements

[JamesLMilner]

Type: bug / feature

The following has been addressed in the PR:

• [x] There is a related issue
• [x] All code has been formatted with prettier as per the readme code style guidelines
• [x] Unit or Functional tests are included in the PR

Description:

This PR aims to do two things:

• Only glob and load commands that match the command that is passed in (rather than loading all)
• When using dojo, dojo --help, dojo -h do not actually load the commands in question as they will never be used

Supersedes #282 #281

Resolves #275

Before:

After: