Tracklog recording v1

issue: #77 (closed)

Implemented a trackLog recording feature into the measurements component, which saves the gps location of the device at a changeable frequency. Default is 1sec.

Each record has its own trackLog in its meta prop, and each session has its own sessionTrackLog at the session's metarecord's meta prop.

The trackLogs are currently saved only when the form is opened. This is not the final version of it, a global gps location Component has to be implemented to save the sessionTrackLog's even if we are outside of the form screen.

Editing and copying a record rewrites the tracklog to the new data. While opening a record, which belongs to an observation where there is an opened list data recording, the app saves the sessionTracklog to that opened session.

Implemented a new settings item type where its a numeric text input where we change the trackLog recording frequency whit an integer. Also added one to change the positionUpdateInterval according to issue #93 (closed)