Correct two laptop profiles. Update readme

Prep new release

Closes #30, #31, #32

Support fn+calc on G712. Customise ROG key

Finalise udev rules for init

Many fixes for debian build

Fix many small bugs in refactor of laptop LED mode handling

Closes issue #27

Try to correct how laptop modes are handled

Add support for GU502

Prep new version

Init device correctly for LED control