Fix alias command

[hesa]

Addressing and closes #149

These commits:

• makes license expression case insensitive
• makes matching license expression not crashing

Example

$ PYTHONPATH=./python ./python/flame/__main__.py aliases -il MIT | head -10
MITNFA -> MITNFA
MIT +no-false-attribs license -> MITNFA
MIT (NFA) License -> MITNFA
MIT +no-false-attribs License -> MITNFA
scancode://mit-no-false-attribs -> MITNFA
MIT no false attribution License -> MITNFA
scancode:mit-no-false-attribs -> MITNFA
MIT-advertising -> MIT-advertising
MIT License (with advertising) -> MIT-advertising
MIT with advertising -> MIT-advertising
..... snip