Added license

Added the MPL-2.0 license, like upstream mal.

Feature update

• str-upper-case, str-lower-case, str-capitalize from @rosineygp
• sh-env to modify environment via shell commands e.g. source and export from @ProfAvery
• Updated @kanaka/mal upstream.
• Bugfix in compiling standalone scripts.

Hello world

v0.1.0

New build.