Unify dispatch for phone state updates so none are missed

Closes #24

See merge request !17

Some strings were exceeding the screen size, making harder to read it

Fixed non-existing Spanish translation causing build failure in FDroid

pt-rBR: fix typo

See merge request !15

Enhancement in Call Blocking Functionality through addition of multiple Call Blocking Modes

See merge request !13

Fix conditional permission requests

See merge request !12

Fix call blocking on API 26-27

See merge request !11

Use TelecomManager only on API 28+, because it requires system permission MODIFY_PHONE_STATE on previous APIs.

Updated gradle-wrapper to version 5.1.1 for F-Droid (problems with gradlew-fdroid clean with version 4.10.1)

Bump ver for FDroid. Hello buildbot!

See merge request !10

Bump version to 0.2.4 so that the F-Droid buildbot kickstarts the build after tagging a new release.

Added new ending call method based on TelephonyManager

See merge request !9

Bump version to 0.2.3 so that the F-Droid buildbot kickstarts the build after tagging a new release.

Keep track of any calls that may already be happening while someone else tries to call us; we don't want to interrupt actual, running calls by mistake. Fixes issue #5.