New release of Csound for Android with improved editor

This release of the Csound for Android app replaces the previous CodeMirror editor with the Ace editor from https://ace.c9.io/. This is to resolve issues with CodeMirror not always saving edits to the code, or losing the correct position of the cursor.

The find and replace menus have been replaced by the Ctrl-F key combination.

There is an editor mode for .csd files and an editor mode for .html files.

The Oboe audio driver has been updated to the current release and seems to run with fewer dropouts.