Fixed Watch window background color on some Mint Linux systems.
Updated package `FindMenuItem` method (#166).
Added package `RemoveMenuItem` method (#166).
Updated recent projects/files handling to allow menus to be removed.
Fixed package `GetStack` method to return proper control (#166).
Added package `Yield` method (#166).
Added `tree:FindItem` method (#166).
Added `onIdle` event (#166).
Added handling of `osname` to package dependencies (#166).