Ending support for old Android versions

[brodycj]

From storesafe/cordova-sqlite-storage#771 I am planning to end support for old Android versions as follows:

• definite: Android pre-4.0
• extremely likely: Android 4.0
• very likely: Android 4.1-4.3

To be partially maintained as described in comment below (#35 (comment)): Android 4.4, old armeabi CPU

[brodycj]

From discussion in storesafe/cordova-sqlite-storage#771 I am planning a compromise approach for Android 4.4, old armeabi CPU (storesafe/cordova-sqlite-storage#771 (comment)) that I would like to apply here as well:

Build for the old armeabi CPU, as needed to support Android 4.4, will be made with some newer features missing such as FTS5, JSON1, BASE64, and possibly some other features such as FTS3, FTS4, and REGEXP.

(Support for the old armeabi CPU increases package size and requires additional testing, hopefully can be dropped sometime later in the future.)