Add LastPendingIntentRequestCode support to TermuxAPIAppSharedPreferences

[EduardDurech]

For use with termux/termux-api#556 and termux/termux-api-package#161

See termux/termux-api#550 and termux/termux-api#246

[agnostic-apollo]

Enabled commitToFile. Also ideally pull requests shouldn't be sent from the master branch, create separate branche for each pull, useful if multiple pull requests need to be sent and you won't have to force push master branch on your repo after merging and can just delete pull branch.

[agnostic-apollo]

Also ideally constant should have been added to TermuxPreferenceConstants javadoc changelog due to some old convention I keep on using. I didn't do it currently cause it would have broken multiple commits on my local repo.

[EduardDurech]

Also ideally pull requests shouldn't be sent from the master branch, create separate branche for each pull, useful if multiple pull requests need to be sent and you won't have to force push master branch on your repo after merging and can just delete pull branch.

Okay, will keep in mind, thanks!