UI improvements for buttons

When opening MacroMaker it could have the:
- Item `File` -> `Save` disabled - you don't have anything to be saved yet
- Button `Stop` disabled - could only be enabled if it's either recording/playing
- Button `Play` disabled - enabled only after a recording or a loaded session

Also after pressing the recording button it could:
- Disable all items from `File` menu
- Enable the `Stop` button and disable the `Play` button and Repeats (until the Stop is pressed)

Just enable the `Play` button if there's a recent session recorded or loaded.
When Playing, disable the `Record` button

And so on..

Those will probably ease the use of the app.