chore: replace superspawn & child_process with execa (#862)

* chore: added execa dependency

Co-authored-by: Raphael von der Grün <raphinesse@gmail.com>

* chore: execa - drop superspawn in android_sdk

Co-authored-by: Raphael von der Grün <raphinesse@gmail.com>

* chore: execa - drop superspawn in build

* chore: execa - drop superspawn in check_reqs

Plus: Remove useless trimming of execa output

Co-authored-by: Raphael von der Grün <raphinesse@gmail.com>

* chore: execa - drop superspawn in emulator

Co-authored-by: Raphael von der Grün <raphinesse@gmail.com>

* chore: execa - drop superspawn in device

Co-authored-by: Raphael von der Grün <raphinesse@gmail.com>

* chore: execa - drop superspawn in run_java_unit_tests

* chore: execa - drop superspawn in ProjectBuilder

Co-authored-by: Raphael von der Grün <raphinesse@gmail.com>

* chore: execa - drop superspawn in adb

* chore: execa - drop superspawn in plugin.spec

* chore: execa - replace child_process in log

* chore: execa - replace child_process in check_reqs

* chore: execa - replace child_process in emulator

Co-authored-by: エリス <erisu@users.noreply.github.com>

package.json

@@ -32,6 +32,7 @@
     "android-versions": "^1.4.0",
     "compare-func": "^1.3.2",
     "cordova-common": "^3.2.0",
+    "execa": "^3.2.0",
     "nopt": "^4.0.1",
     "properties-parser": "^0.3.1",
     "q": "^1.5.1",