Generate gemspec for version 0.0.63

`initial_color` as alias for `initialcolor` attribute on `choose_colo…

…r` built-in dialog

Fix issue with Hello, Entry! breaking after the latest release due to…

… mistakenly converting color to by thinking it is hex

Accept hex color strings not starting with `#` (e.g. `background f828…

…d7`)

Auto-Default to `validate key` on an `entry` when defining `validatec…

…ommand {}`, `on(validate) {}`, `invalidcommand {}`, `on(invalid) {}`

Support tk variable tracing via on_var(tracing_operation) {} listeners

Hello, Theme! sample

Hello, Progressbar! sample / Upgrade to glimmer 2.7.3

Hello, Scale! & `scale` `variable` data-binding

Add default padding to `labelframe`