adds the ability to record and attach one or more audio messages using the device microphone to capture audio like described in post #64 (comment) but... no drag microphone up or left (because no auto-send) - just touch mic to start recording.

• click the mic to start recording... or... choose the new record an audio message item from the attach menu
• click the trash button at any time to ditch the audio recording
• click the attach button at any time to attach to the current message
• click the big stop wavey button to stop recording and see a player
• click the big mic wavey button to start recording again (from scratch, not append)

records in amr wideband format. filename template is 'recorded-{uuid}.3ga'. originally designed to use date and time in the filename, but changed because date/time would leak recorded at time info to recipients.

requires new record_audio permission. included in manifest, but should also ask at runtime on newer android versions (https://developer.android.com/media/platform/mediarecorder#audio-record-permission).

viddy;

closes #64